MacKenzie Scott glows at the 2017 Academy Awards (Shutterstock) 2. She’s The Third-Richest Woman In The World. With an estimated net worth of $53 billion, MacKenzie is the third-wealthiest woman in the world, behind French heiress Francoise Bettencourt Meyers and Wal-Mart’s Alice Walton. She’s the 22nd wealthiest person in the world overall.