We're dividing 810478 by 3 
Let's see how many times 3 fits into 810478.

Step 1:
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: 2.0
Subtracting 6 from 8 leaves us with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 3

Advancing to step 2:
The number 3 fits into 21 7 times, leaving a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 27.0
Subtract 21 from 21 to get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 3

Let's proceed to step 3:
The number 3 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 270.0
Subtracting 0 from 0 leaves us with 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 3

Let's proceed to step 4:
3 goes into 4 1 times with a remainder of 1.
The next digit of our result is 1. 
Result so far: 2701.0
If we subtract 3 from 4, we get 1.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 3

Going ahead to step 5:
17 divided by 3 is 5 with a remainder of 2.
Put 5 as the next digit of the answer. 
Result so far: 27015.0
Subtracting 15 from 17 leaves us with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 3

Advancing to step 6:
3 goes into 28 9 times with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 270159.0
Deduct 27 from 28 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.

Step 7:
The number 3 fits into 10 3 times, leaving a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 270159.3
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.

Advancing to step 8:
3 goes into 10 3 times with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 270159.33
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.

In conclusion, the division gives 270159.33 with a balance of 0.001.