We look at the division of 129215 by 28 
We're looking to find how many times 28 goes into 129215.

Moving on to step 1:
28 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 28

Step 2:
When dividing 12 by 28, we get 0 with a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Append the next digit (9) from the dividend to 12 and continue with: 129 / 28

Let's proceed to step 3:
28 can be fit into 129 4 times, resulting in a remainder of 17.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 112 from 129, we get 17.
Include the next digit (2) from the dividend after 17, then repeat: 172 / 28

On to step 4:
28 goes into 172 6 times with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 46.0
Subtracting 168 from 172 leaves us with 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 28

Step 5:
When dividing 41 by 28, we get 1 with a remainder of 13.
Use 1 as the next digit of our solution. 
Result so far: 461.0
Subtract 28 from 41 to get 13.
Grab the next digit (5) from the dividend, add it to 13, then carry on: 135 / 28

Going ahead to step 6:
135 divided by 28 is 4 with a remainder of 23.
Record the quotient 4 as the next digit in the result. 
Result so far: 4614.0
The remainder is 23 after subtracting 112 from 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 7:
28 can be fit into 230 8 times, resulting in a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 4614.8
The remainder is 6 after subtracting 224 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
If we divide 60 by 28, we get 2 and a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 4614.82
If we take 56 away from 60, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 9:
The number 28 fits into 40 1 times, leaving a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 4614.821
If we take 28 away from 40, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 10:
When dividing 120 by 28, we get 4 with a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 4614.8214
The remainder is 8 after subtracting 112 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 11:
80 divided by 28 is 2 with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 4614.82142
Subtract 56 from 80 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 12:
The number 28 fits into 240 8 times, leaving a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 4614.821428
The remainder is 16 after subtracting 224 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 13:
The number 28 fits into 160 5 times, leaving a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 4614.8214285
If we subtract 140 from 160, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 14:
If we divide 200 by 28, we get 7 and a remainder of 4.
Put 7 as the next digit of the answer. 
Result so far: 4614.82142857
Subtracting 196 from 200 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

In conclusion, the division gives 4614.82142857 with a balance of 4e-09.