We're dividing 128873 by 15 
We're looking to find how many times 15 goes into 128873.

Let's proceed to step 1:
When dividing 1 by 15, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 15

Moving on to step 2:
If we divide 12 by 15, we get 0 and a remainder of 12.
The number 0 becomes the next digit in our result. 
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 / 15

Moving on to step 3:
If we divide 128 by 15, we get 8 and a remainder of 8.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtract 120 from 128 to get 8.
Grab the next digit (8) from the dividend, add it to 8, then carry on: 88 / 15

On to step 4:
88 divided by 15 is 5 with a remainder of 13.
The next digit of our result is 5. 
Result so far: 85.0
Deduct 75 from 88 and we're left with 13.
Include the next digit (7) from the dividend after 13, then repeat: 137 / 15

Going ahead to step 5:
15 can be fit into 137 9 times, resulting in a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 859.0
Subtract 135 from 137 to get 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 15

Step 6:
15 goes into 23 1 times with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 8591.0
Subtract 15 from 23 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 7:
If we divide 80 by 15, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 8591.5
Subtracting 75 from 80 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 8:
If we divide 50 by 15, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 8591.53
Deduct 45 from 50 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
15 can be fit into 50 3 times, resulting in a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 8591.533
Subtracting 45 from 50 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final result is 8591.533 with a remainder of 0.0005.