The value of	489.1375 x 0.0483 x 1.956	is closest to:
	0.0873 x 92.581 x 99.749

Then x = (3889 + 12.952) - 3854.002

   = 3901.952 - 3854.002

   = 47.95.

Since the last digit to the extreme right will be zero (since 5 x 4 = 20), so there will be 6 significant digits to the right of the decimal point.

For the given expression to be a perfect square, we must have

11.98 x x = 2 x 11.98 x 0.02 or x   = 0.04

0.2 = 0.222...;

(0.2)² = 0.04.

0.04 < 0.2 < 0.22....<5.

Since 0.04 is the least, so (0.2)² is the least.