$$4 \times \frac{ 22 }{ 7 } \times 10.5 \times 10.5$$
$1386$
$$\frac{4\times 22}{7}\times 10.5\times 10.5$$
$$\frac{88}{7}\times 10.5\times 10.5$$
$$\frac{88}{7}\times \frac{21}{2}\times 10.5$$
$$\frac{88\times 21}{7\times 2}\times 10.5$$
$$\frac{1848}{14}\times 10.5$$
$$132\times 10.5$$
$$1386$$
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$2\times 7\times 11\times 3^{2}$
