Well, God says we prosper when our souls prosper. That doesn't only mean financially but it can mean physically, emotionally, spiritually (the best one). God gives us the ability to get wealth but that's not the only way we prosper. I don't know if this is the answer you want...
Let me rephrase my question "How did he prosper?"
I don't mean "what prosperity has he attained?"
I mean "how did he attain it?"