The number is already rounded to a greater degree than that!
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The decimal for four and one seventh is 4.143 (rounded).
It is 19299522.0000
8.6 is rounded to nine because the number after the decimal is greater than four, so the number is rounded higher. If the number after the decimal is five or greater, the number rounds up. If the number after the decimal is four or less, then the number rounds down.
log(245) = 2.3892 (rounded)
33.487 is already rounded to three decimal places. if it were 33.4829, which is four decimal places, you would round it to the nearest three DECIMAL places, which would be 33.487. So, the answer to your question is; 33.487 is already rounded to three decimal places.