Meta chief Mark Zuckerberg became the world’s fourth-richest person Thursday, overtaking Michael Dell as Meta shares rose over 4% after the release of Muse, the company’s personal artificial intelligence agent. Muse recently reached the App Store’s top free apps, surpassing ChatGPT. Dell shares have fallen nearly 9% this week, although they have gained 325% since the start of the year from a price of about $127. Michael Dell’s net worth had surged in September, briefly moving him to No. 2 on the Forbes billionaire list ahead of Google co-founder Larry Page. Dell Technologies reported record revenue of $47 billion in its latest earnings report, including $16.4 billion from its AI server business. Meta reported a 28% increase in second-quarter revenue to $60.8 billion and expects capital expenditures of $130 billion to $145 billion this year.