Top 1% of World

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Sources such as this claim that Americans are in the top 1% of world income earners:
http://www.investopedia.com/articles/personal-finance/050615/are-you-top-one-percent-world.asp
http://www.globalrichlist.com/

"According to the Global Rich List, a website that brings awareness to worldwide income disparities, an income of $32,400 a year will allow you to make the cut. Using current exchange rates, that amounts to roughly:
29,185 euros
2.2 million Indian rupees, or
211,126 Chinese yuan
So if you’re an accountant, a registered nurse or even an elementary school teacher, congratulations. The average wage for any of these careers falls well within the top 1% worldwide."


How can the majority of Americans be in the top 1%, given even worst case scenario, if we make up 4.35% of the world's population?
https://en.wikipedia.org/wiki/World_population#Largest_populations_by_country

And that the median income of the US per capita is $30,240?https://en.wikipedia.org/wiki/Personal_income_in_the_United_States

Which is an amount the globalrichlist.com website claims is in the top 1.2%.

So if half of Americas population is in the top 1.2% of the world, and also makes up 2.175% (half of US pop of 4.35%) of the world population. How is that mathematically possible giving them every single benefit of the doubt? You can not fit 2.175% of the world's population in a category that makes up 1.2% of the world's population. That is mathematically unsound. Where have I gone wrong or are these websites wrong?