49.285371 = 0049.285371
there's a 0 in the thousands place.
one digit to the right, in the hundreds place, is also 0.
the digit in the hundreds place is less than 5, so we leave the digit in the thousands place alone.
everything to the right of the thousands place is replaced with 0s
0000.000000 = 0
if you meant to the nearest thousandth, then:
49.285371
there's a 5 in the thousandths place
one digit over, in the ten thousandths place, is a 3.
3 is less than 5, so we leave the thousandths place alone and replace everything to the right with 0s.
49.285000 or just 49.285