When Jeff and MacKenzie got divorced after 26 years together, she instantly had a net worth of $38 billion and became one of the richest people and richest women in the world. This makes her the 4th richest woman in the world behind Alice Walton ($54b), Julia Flesher Koch ($55b), and Francoise Bettencourt-Meyers ($58b). Richest Woman In The World?