My Rapid Leaderboards percentile is 93.7% , but if there are 78,263,771 players, and my Global Rank is 887,720 then my percentile should be [ 1 - (887,720) / (78,263,771) ] x 100% = 98.9%
Percentile is not percentage.
https://support.chess.com/en/articles/8572866-what-does-percentile-mean
My Rapid Leaderboards percentile is 93.7% , but if there are 78,263,771 players, and my Global Rank is 887,720 then my percentile should be [ 1 - (887,720) / (78,263,771) ] x 100% = 98.9%