We're dividing 15987107 by 809 
We're looking to find how many times 809 goes into 15987107.

Step 1:
809 goes into 1 0 times 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.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 809

Let's proceed to step 2:
When dividing 15 by 809, we get 0 with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 809

Moving on to step 3:
If we divide 159 by 809, we get 0 and a remainder of 159.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 159, we get 159.
Bring next digit (8) of the dividend behind the 159 and repeat the process: 1598 / 809

Step 4:
809 goes into 1598 1 times with a remainder of 789.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 809 from 1598, we get 789.
Append the next digit (7) from the dividend to 789 and continue with: 7897 / 809

Advancing to step 5:
7897 divided by 809 is 9 with a remainder of 616.
Put 9 as the next digit of the answer. 
Result so far: 19.0
If we take 7281 away from 7897, we end up with 616.
Bring next digit (1) of the dividend behind the 616 and repeat the process: 6161 / 809

On to step 6:
The number 809 fits into 6161 7 times, leaving a remainder of 498.
Use 7 as the next digit of our solution. 
Result so far: 197.0
Deduct 5663 from 6161 and we're left with 498.
Grab the next digit (0) from the dividend, add it to 498, then carry on: 4980 / 809

Moving on to step 7:
The number 809 fits into 4980 6 times, leaving a remainder of 126.
Record the quotient 6 as the next digit in the result. 
Result so far: 1976.0
Subtract 4854 from 4980 to get 126.
Append the next digit (7) from the dividend to 126 and continue with: 1267 / 809

On to step 8:
The number 809 fits into 1267 1 times, leaving a remainder of 458.
The next digit of our result is 1. 
Result so far: 19761.0
If we take 809 away from 1267, we end up with 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

Moving on to step 9:
If we divide 4580 by 809, we get 5 and a remainder of 535.
Use 5 as the next digit of our solution. 
Result so far: 19761.5
If we take 4045 away from 4580, we end up with 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

Step 10:
809 can be fit into 5350 6 times, resulting in a remainder of 496.
Put 6 as the next digit of the answer. 
Result so far: 19761.56
Subtract 4854 from 5350 to get 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Step 11:
4960 divided by 809 is 6 with a remainder of 106.
The number 6 becomes the next digit in our result. 
Result so far: 19761.566
Subtracting 4854 from 4960 leaves us with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

After the division, we end up with 19761.566 and a remainder of 0.0106.