What is 15.3 percent of 840.78 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 840.78 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 840.78 is 100%, so we can write it down as 840.78=100%.
4. We know, that x is 15.3% of the output value, so we can write it down as x=15.3%.
5. Now we have two simple equations:
1) 840.78=100%
2) x=15.3%
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
840.78/x=100%/15.3%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 15.3% of 840.78

840.78/x=100/15.3
(840.78/x)*x=(100/15.3)*x       - we multiply both sides of the equation by x
840.78=6.5359477124183*x       - we divide both sides of the equation by (6.5359477124183) to get x
840.78/6.5359477124183=x
128.63934=x
x=128.63934

now we have:
15.3% of 840.78=128.63934