We're dividing 12896401 by 856 
We're looking to find how many times 856 goes into 12896401.

Step 1:
1 divided by 856 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 856

Advancing to step 2:
12 divided by 856 is 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 856

Step 3:
856 goes into 128 0 times with a remainder of 128.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 128 and we're left with 128.
Append the next digit (9) from the dividend to 128 and continue with: 1289 / 856

Going ahead to step 4:
1289 divided by 856 is 1 with a remainder of 433.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 856 from 1289 leaves us with 433.
Append the next digit (6) from the dividend to 433 and continue with: 4336 / 856

Let's proceed to step 5:
4336 divided by 856 is 5 with a remainder of 56.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we take 4280 away from 4336, we end up with 56.
Bring next digit (4) of the dividend behind the 56 and repeat the process: 564 / 856

Going ahead to step 6:
If we divide 564 by 856, we get 0 and a remainder of 564.
Put 0 as the next digit of the answer. 
Result so far: 150.0
The remainder is 564 after subtracting 0 from 564.
Grab the next digit (0) from the dividend, add it to 564, then carry on: 5640 / 856

Advancing to step 7:
856 goes into 5640 6 times with a remainder of 504.
Use 6 as the next digit of our solution. 
Result so far: 1506.0
Subtract 5136 from 5640 to get 504.
Take the next digit (1) from the dividend and append it to 504, then repeat: 5041 / 856

Moving on to step 8:
If we divide 5041 by 856, we get 5 and a remainder of 761.
The next digit of our result is 5. 
Result so far: 15065.0
Deduct 4280 from 5041 and we're left with 761.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7610, and continue the process.

On to step 9:
856 goes into 7610 8 times with a remainder of 762.
Use 8 as the next digit of our solution. 
Result so far: 15065.8
Deduct 6848 from 7610 and we're left with 762.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7620, and continue the process.

On to step 10:
The number 856 fits into 7620 8 times, leaving a remainder of 772.
Record the quotient 8 as the next digit in the result. 
Result so far: 15065.88
If we subtract 6848 from 7620, we get 772.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7720, and continue the process.

The final outcome is 15065.88, with a leftover of 0.772.