Diego, Mariana, Felipe and Juanita pooled their capital to start a company producing women's shoes, contributing 15%, 20%, 25% and 40%, respectively, of the total amount. If Diego made the smallest of the contributions in the amount of $9,000,000, was the largest contribution made by Juanita?

Let the total amount be represented by $x.
- Diego contributed 15% of the total amount, which is $9,000,000.
- So, we can set up the equation: $0.15x = $9,000,000.
- Solving for x, we get: $x = \frac{$9,000,000}{0.15} = $60,000,000.

Now let's find out the contributions made by Mariana, Felipe, and Juanita:
- Mariana contributed 20% of $60,000,000 = $0.20 \cdot $60,000,000 = $12,000,000.
- Felipe contributed 25% of $60,000,000 = $0.25 \cdot $60,000,000 = $15,000,000.
- Juanita contributed 40% of $60,000,000 = $0.40 \cdot $60,000,000 = $24,000,000.

Clearly, Juanita made the largest contribution, which was $24,000,000.

\boxed{Juanita's\ contribution: $24,000,000}