$$458 \sqrt{ \frac{ 7 }{ 458 \times 7 \times 21 } }$$
$\frac{\sqrt{9618}}{21}\approx 4.670066789$
$$458\sqrt{\frac{7}{3206\times 21}}$$
$$458\sqrt{\frac{7}{67326}}$$
$$458\sqrt{\frac{1}{9618}}$$
$$458\times \frac{\sqrt{1}}{\sqrt{9618}}$$
$$458\times \frac{1}{\sqrt{9618}}$$
$$458\times \frac{\sqrt{9618}}{\left(\sqrt{9618}\right)^{2}}$$
$$458\times \frac{\sqrt{9618}}{9618}$$
$$\frac{\sqrt{9618}}{21}$$
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