We divide 858931 by 3
We're looking to find how many times 3 goes into 858931.

Step 1:
When dividing 8 by 3, we get 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 6 away from 8, we end up with 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 3

Going ahead to step 2:
25 divided by 3 is 8 with a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 28.0
Subtract 24 from 25 to get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 3

On to step 3:
When dividing 18 by 3, we get 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 286.0
Deduct 18 from 18 and we're left with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 3

On to step 4:
The number 3 fits into 9 3 times, leaving a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 2863.0
Subtract 9 from 9 to get 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 3

Moving on to step 5:
3 goes into 3 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 28631.0
If we take 3 away from 3, we end up with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 3

Let's proceed to step 6:
When dividing 1 by 3, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 286310.0
Subtract 0 from 1 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
When dividing 10 by 3, we get 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 286310.3
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 8:
10 divided by 3 is 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 286310.33
Subtracting 9 from 10 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final outcome is 286310.33, with a leftover of 0.001.