Question

2 3,4
--------=------=
2,21 3х

Answer 1

2*3x=2,21 *3,4

x=2,21 * 3,4 / 2*3

x=2,21 * 1,7/3 = 3.757/3=3757/3000 = 3 757/3000 = 

Answer 2

$frac{2}{2,21} = frac{3,4}{3x}$
3x=2,21*3,4/2
3x=3,757
x=$1 frac{757}{3000}$