$$\frac { 1 } { 5 } \times ( 7 \times \frac { 4 } { 9 } ) ( \frac { 1 } { 5 } \times 7 ) \times \frac { 4 } { 4 }$$
$\frac{196}{225}\approx 0.871111111$
$$\frac{1}{5}\times 7\times \frac{4}{9}\times \frac{1}{5}\times 7\times 1$$
$$\frac{7}{5}\times \frac{4}{9}\times \frac{1}{5}\times 7\times 1$$
$$\frac{7\times 4}{5\times 9}\times \frac{1}{5}\times 7\times 1$$
$$\frac{28}{45}\times \frac{1}{5}\times 7\times 1$$
$$\frac{28\times 1}{45\times 5}\times 7\times 1$$
$$\frac{28}{225}\times 7\times 1$$
$$\frac{28\times 7}{225}\times 1$$
$$\frac{196}{225}\times 1$$
$$\frac{196}{225}$$
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$\frac{2 ^ {2} \cdot 7 ^ {2}}{3 ^ {2} \cdot 5 ^ {2}} = 0.8711111111111111$
