Lay out the sentence:
12100 is 27.9% of the total employees.
This is the same as saying "12100 out of
the total number of employees is equal to
27.9 out of 100.
Obtain by cross-multiplication of ratios:
12100 × 100 = 27.9 × total employees.
Then the total number of employees is
1210000 ÷ 27.9 or 43369.17563.
Drop the decimals to gain 43369 "whole"
employees worldwide.