If Bill Gates donates so much of his money, how is he still one of the top three richest people in the world?

Bill and Melinda Gates are giving their three kids "a minuscule portion" of their estimated $89 billion, they told the Daily Mail in 2011. "It will mean they have to find their own way," Bill said at the time.
Although even a fraction of the Gates' wealth will be enough to put their kids among the wealthiest individuals in the world, Bill believes it will compel them to rely on themselves. "It's not a favor to kids to have them have huge sums of wealth," he told "This Morning" last year, as reported by SFGate. "It distorts anything they might do, creating their own path."
The couple plans to put the majority of their fortune toward charitable causes, namely the Bill & Melinda Gates Foundation, which aims to eradicate disease, poverty and hunger across the globe. Along with fellow billionaire Warren Buffett, the Gateses also helped create the Giving Pledge in 2010, which encourages more of the super-rich to leave the majority of their wealth to philanthropic causes.