1/3 = 1 ÷ 3 = 0.333... (with the 3 recurring).
When rounding to any number of decimal places it will round down, so stop after as many 3s as decimal places to which you want to round.
eg to 1 dp 1/3 ≈ 0.3
to 4 dp 1/3 ≈ 0.3333
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17.635 already is rounded to 3 decimal places.
It is 87.656 when rounded to 3 decimal places
It is then 4.226 when rounded to 3 decimal places
Since the 7 is over 1/2 - 2.4 is your answer. Anything 5 and above you round up.
17.17642 rounded to three decimal places is 17.176.