Rather than seeking contrived numbers to reinforce your preconceive notions, you could actually spend a few seconds on google to figure it out. The article talks about ownership so:
Net world wealth $263,242bil [1]
World population 7bil [2]
Thus you need roughly $2million in assets to be in the world 1%
[1]http://en.wikipedia.org/wiki/National_wealth
[2]https://www.google.com/search?q=world+population&ie=utf-8&oe...