find past value in growth rate equation

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I know the following things for a problem.

Percent growth over a 3 year period was 11,200%

The present value is $24,000,000 And the past value is x

The growth rate equation is % growth = (Present - Past) / Past Which gives me this:

11,200% = (24,000,000 - x) / x 

How would I solve for x?

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Since we are given a percentage we will need to divide by 100%

$$\frac{11200}{100}=\frac{24000000-x}{x}$$

After cross multiplying you obtain

$$11200 x=2400000000-100 x$$

After adding 100x to both sides

$$11300 x = 2400000000$$

Then, solve for x

$$x=\frac{2400000000}{11300}$$

$$x = 212389$$