We're dividing 12860490 by 255 
We want to divide 12860490 by 255.

Advancing to step 1:
When dividing 1 by 255, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 255

Step 2:
255 can be fit into 12 0 times, resulting in a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Append the next digit (8) from the dividend to 12 and continue with: 128 / 255

Going ahead to step 3:
If we divide 128 by 255, we get 0 and a remainder of 128.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 128, we get 128.
Fetch the next digit (6) from the dividend, attach it to 128 and continue: 1286 / 255

Step 4:
1286 divided by 255 is 5 with a remainder of 11.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 1275 from 1286, we get 11.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 255

Moving on to step 5:
255 can be fit into 110 0 times, resulting in a remainder of 110.
Put 0 as the next digit of the answer. 
Result so far: 50.0
Deduct 0 from 110 and we're left with 110.
Append the next digit (4) from the dividend to 110 and continue with: 1104 / 255

On to step 6:
255 can be fit into 1104 4 times, resulting in a remainder of 84.
Use 4 as the next digit of our solution. 
Result so far: 504.0
Subtracting 1020 from 1104 leaves us with 84.
Bring next digit (9) of the dividend behind the 84 and repeat the process: 849 / 255

Let's proceed to step 7:
If we divide 849 by 255, we get 3 and a remainder of 84.
Use 3 as the next digit of our solution. 
Result so far: 5043.0
If we subtract 765 from 849, we get 84.
Include the next digit (0) from the dividend after 84, then repeat: 840 / 255

Moving on to step 8:
The number 255 fits into 840 3 times, leaving a remainder of 75.
The number 3 becomes the next digit in our result. 
Result so far: 50433.0
Subtract 765 from 840 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Let's proceed to step 9:
255 goes into 750 2 times with a remainder of 240.
Put 2 as the next digit of the answer. 
Result so far: 50433.2
Subtract 510 from 750 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Moving on to step 10:
2400 divided by 255 is 9 with a remainder of 105.
The next digit of our result is 9. 
Result so far: 50433.29
Subtract 2295 from 2400 to get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Moving on to step 11:
If we divide 1050 by 255, we get 4 and a remainder of 30.
Use 4 as the next digit of our solution. 
Result so far: 50433.294
Subtract 1020 from 1050 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 12:
The number 255 fits into 300 1 times, leaving a remainder of 45.
Record the quotient 1 as the next digit in the result. 
Result so far: 50433.2941
The remainder is 45 after subtracting 255 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 13:
255 goes into 450 1 times with a remainder of 195.
Write down 1 as next digit of the result. 
Result so far: 50433.29411
Deduct 255 from 450 and we're left with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

The final outcome is 50433.29411, with a leftover of 0.000195.