Shareholding in international financial institutions like the ADB can shift over time due to various factors. It's essential to refer to the ADB's official website for the most up-to-date figures. As of the likely timeframe of this question (around 2021-2022), the approximate voting power distribution was: USA (15.6%), Australia (5.8%), China (6.4%), and India (6.5%). Therefore, the correct ascending order of shareholding is USA, Australia, China, and India. These figures can be confirmed by checking the ADB member information page.