$$168 \sqrt{ 5/ \frac{ 168 }{ 168 \times 5 \times 168 } }$$
$1680\sqrt{42}\approx 10887.644373325$
$$168\sqrt{\frac{5\times 168\times 5\times 168}{168}}$$
$$168\sqrt{5\times 5\times 168}$$
$$168\sqrt{25\times 168}$$
$$168\sqrt{4200}$$
$$168\times 10\sqrt{42}$$
$$1680\sqrt{42}$$
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