There's no universally agreed-upon ranking of the "top 10" fraternities in the world. Rankings would vary wildly depending on the criteria used (wealth, philanthropy, academic achievement, number of chapters, prestige within a specific region, etc.). Furthermore, many prominent fraternities are national or regional, not global.
To illustrate, a ranking focusing on philanthropy might heavily feature organizations with strong fundraising efforts, while a prestige-based ranking might focus on those with a long history, influential alumni, and selective membership. There is no central global governing body for fraternities to create a definitive list.