"We ... expect an overall increase of 200 billion (dollars)of Multilateral Development Banks' (MDBs) lending capacity over the next ten years by optimizing their balance sheets and taking more risks," the summit's final statement obtained by Reuters said.
"If these reforms are implemented, MDBs may need more capital," it added.
The Paris summit, hosted by French President Emmanuel Macron, gathered around two dozen leaders from Africa, China's prime minister and Brazil's president had gathered to give impetus to a new global finance agenda.
Many of the around 40 leaders gathered in Paris voiced concerns that the World Bank and the International Monetary Fund were increasingly outdated for tackling challenges like climate change and post-COVID debt burdens of poor countries.
U.S Treasury Secretary Janet Yellen said in Paris ahead of the summit that efforts to squeeze more lending from these development lenders had to be carried out before considering the possibility of capital increases.
The U.S. is the largest shareholder of the IMF and World Bank.
At the summit, wealthy nations finalised an overdue $100-billion climate finance pledge to developing countries and created a fund for biodiversity and the protection of forests.
The summit aims to create multifaceted roadmaps that can be used over the next 18-24 months, ranging from debt relief to climate finance. Many of the topics on the agenda take up suggestions from a group of developing countries, led by Barbados Prime Minister Mia Mottley, dubbed the 'Bridgetown Initiative'.
"There is the political consensus that this issue is bigger than each of us and we have to work together and multilateral development banks will have to change how they do business and that is accepted," Mottley said at the summit's final panel.
"We leave Paris not with speeches simply, but a commitment to get down into the granular details to make sure that what we agree here can be executed."
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