7.416/4120 is the fraction. To convert to a percentage multiply by 100:
7.416*100/4120=741.6/4120%.
If we multiply the numerator by 10, the decimal point will disappear; but we must multiply the denominator by 10 to balance:
7416/41200=927/5150=9*103/50*103=9/50=0.18% (90/5*100=18/100).