We're dividing 12739367 by 866 
We want to figure out the number of times 12739367 can be divided by 866.

Step 1:
When dividing 1 by 866, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 866

Step 2:
If we divide 12 by 866, we get 0 and a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (7) of the dividend behind the 12 and repeat the process: 127 / 866

Let's proceed to step 3:
866 can be fit into 127 0 times, resulting in a remainder of 127.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 127 and we're left with 127.
Bring next digit (3) of the dividend behind the 127 and repeat the process: 1273 / 866

Going ahead to step 4:
1273 divided by 866 is 1 with a remainder of 407.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 866 from 1273, we get 407.
Bring next digit (9) of the dividend behind the 407 and repeat the process: 4079 / 866

Going ahead to step 5:
When dividing 4079 by 866, we get 4 with a remainder of 615.
The next digit of our result is 4. 
Result so far: 14.0
Subtract 3464 from 4079 to get 615.
Bring next digit (3) of the dividend behind the 615 and repeat the process: 6153 / 866

Advancing to step 6:
When dividing 6153 by 866, we get 7 with a remainder of 91.
The next digit of our result is 7. 
Result so far: 147.0
Deduct 6062 from 6153 and we're left with 91.
Grab the next digit (6) from the dividend, add it to 91, then carry on: 916 / 866

On to step 7:
When dividing 916 by 866, we get 1 with a remainder of 50.
Use 1 as the next digit of our solution. 
Result so far: 1471.0
If we subtract 866 from 916, we get 50.
Grab the next digit (7) from the dividend, add it to 50, then carry on: 507 / 866

Step 8:
866 goes into 507 0 times with a remainder of 507.
Write down 0 as next digit of the result. 
Result so far: 14710.0
Subtract 0 from 507 to get 507.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5070, and continue the process.

Going ahead to step 9:
If we divide 5070 by 866, we get 5 and a remainder of 740.
Record the quotient 5 as the next digit in the result. 
Result so far: 14710.5
Deduct 4330 from 5070 and we're left with 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7400, and continue the process.

Moving on to step 10:
When dividing 7400 by 866, we get 8 with a remainder of 472.
Record the quotient 8 as the next digit in the result. 
Result so far: 14710.58
Subtract 6928 from 7400 to get 472.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4720, and continue the process.

Going ahead to step 11:
If we divide 4720 by 866, we get 5 and a remainder of 390.
The number 5 becomes the next digit in our result. 
Result so far: 14710.585
Subtracting 4330 from 4720 leaves us with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Going ahead to step 12:
If we divide 3900 by 866, we get 4 and a remainder of 436.
The next digit of our result is 4. 
Result so far: 14710.5854
The remainder is 436 after subtracting 3464 from 3900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Moving on to step 13:
866 goes into 4360 5 times with a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 14710.58545
If we take 4330 away from 4360, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 14:
When dividing 300 by 866, we get 0 with a remainder of 300.
Put 0 as the next digit of the answer. 
Result so far: 14710.58545
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

On to step 15:
When dividing 3000 by 866, we get 3 with a remainder of 402.
The next digit of our result is 3. 
Result so far: 14710.5854503
Subtract 2598 from 3000 to get 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

Step 16:
866 can be fit into 4020 4 times, resulting in a remainder of 556.
The number 4 becomes the next digit in our result. 
Result so far: 14710.58545034
The remainder is 556 after subtracting 3464 from 4020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5560, and continue the process.

In conclusion, the division gives 14710.58545034 with a balance of 5.56e-07.