Turns out, you can't just play an instrumental part in building the most popular fast food restaurant in the world without earning a fair fortune along the way. Such was the case with Ray Kroc, whose net worth at the time of his death was a whopping $600 million, according to wealth estimation site Celebrity Net Worth. That's a pretty nice payday for peddling Big Macs

Here's the thing, though: His $600 million net worth was way back in 1984. McDonald's hasn't exactly grown smaller in the three and a half decades since then, so what would his fortune look like with the company's size today? After all, his third wife, Joan Kroc, died in 2003, and was worth an estimated $3 billion when she died. If Kroc would be alive today, it's estimated that his fortune would be somewhere around $18 billion.