What is 123456789 percent of 999999999 - 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 999999999 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 999999999 is 100%, so we can write it down as 999999999=100%.
4. We know, that x is 123456789% of the output value, so we can write it down as x=123456789%.
5. Now we have two simple equations:
1) 999999999=100%
2) x=123456789%
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:
999999999/x=100%/123456789%
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 123456789% of 999999999

999999999/x=100/123456789
(999999999/x)*x=(100/123456789)*x       - we multiply both sides of the equation by x
999999999=8.10000007371E-7*x       - we divide both sides of the equation by (8.10000007371E-7) to get x
999999999/8.10000007371E-7=x
1.2345678887654E+15=x
x=1.2345678887654E+15

now we have:
123456789% of 999999999=1.2345678887654E+15