$$9/478 \div 9/78 \div 9/478$$
$\frac{1}{160395768}\approx 6.234578458 \cdot 10^{-9}$
$$\frac{\frac{\frac{\frac{9}{478}}{9}}{78}}{9\times 478}$$
$$\frac{\frac{\frac{9}{478}}{9\times 78}}{9\times 478}$$
$$\frac{\frac{\frac{9}{478}}{702}}{9\times 478}$$
$$\frac{\frac{9}{478\times 702}}{9\times 478}$$
$$\frac{\frac{9}{335556}}{9\times 478}$$
$$\frac{\frac{1}{37284}}{9\times 478}$$
$$\frac{\frac{1}{37284}}{4302}$$
$$\frac{1}{37284\times 4302}$$
$$\frac{1}{160395768}$$
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$\frac{1}{2 ^ {3} \cdot 3 ^ {3} \cdot 13 \cdot 239 ^ {2}} = 6.234578458454091 \times 10^{-9}$
