We look at the division of 861458 by 3 
We're looking to find how many times 3 goes into 861458.

On to step 1:
3 goes into 8 2 times with a remainder of 2.
The next digit of our result is 2. 
Result so far: 2.0
If we take 6 away from 8, we end up with 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 3

Step 2:
When dividing 26 by 3, we get 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 28.0
If we subtract 24 from 26, we get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 3

Let's proceed to step 3:
3 goes into 21 7 times with a remainder of 0.
The next digit of our result is 7. 
Result so far: 287.0
If we take 21 away from 21, we end up with 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 3

Let's proceed to step 4:
The number 3 fits into 4 1 times, leaving a remainder of 1.
The next digit of our result is 1. 
Result so far: 2871.0
The remainder is 1 after subtracting 3 from 4.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 3

Advancing to step 5:
3 goes into 15 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 28715.0
Subtract 15 from 15 to get 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 3

Let's proceed to step 6:
3 can be fit into 8 2 times, resulting in a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 287152.0
Subtracting 6 from 8 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 7:
20 divided by 3 is 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 287152.6
If we subtract 18 from 20, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
If we divide 20 by 3, we get 6 and a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 287152.66
If we subtract 18 from 20, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 287152.66 with a remainder of 0.002.