This question can be solved by:
[tex] \frac{8.3}{100} = \frac{35,600}{x} [/tex]
Cross multiply to get: 8.3x = 3,560,000
To let the x stand along (since you are finding the x value), divide 8.3 to both sides of the equal sign.
[tex] \frac{8.3x}{8.3} = \frac{3560000}{8.3} [/tex]
Simplify to get the answer.
