\[\left( \frac{125}{36} \right)^{4} \cdot \left( \frac{2}{5} \right)^{5} \cdot \left( \frac{3}{5} \right)^{7} =\]
\[= \left( \frac{5^{3}}{2^{2} \cdot 3^{2}} \right)^{4} \cdot \left( \frac{2}{5} \right)^{5} \cdot \left( \frac{3}{5} \right)^{7} =\]
\[= \frac{5^{12} \cdot 2^{5} \cdot 3^{7}}{2^{8} \cdot 3^{8} \cdot 5^{5} \cdot 5^{7}} = \frac{1}{2^{3} \cdot 3} = \frac{1}{24}.\]