We look at the division of 8631840 by 887 
The aim is to understand the frequency of 887 in 8631840.

Advancing to step 1:
887 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 887

Step 2:
86 divided by 887 is 0 with a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 86, we get 86.
Bring next digit (3) of the dividend behind the 86 and repeat the process: 863 / 887

Going ahead to step 3:
863 divided by 887 is 0 with a remainder of 863.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 863 leaves us with 863.
Include the next digit (1) from the dividend after 863, then repeat: 8631 / 887

Going ahead to step 4:
8631 divided by 887 is 9 with a remainder of 648.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtract 7983 from 8631 to get 648.
Include the next digit (8) from the dividend after 648, then repeat: 6488 / 887

Step 5:
887 goes into 6488 7 times with a remainder of 279.
Record the quotient 7 as the next digit in the result. 
Result so far: 97.0
Deduct 6209 from 6488 and we're left with 279.
Take the next digit (4) from the dividend and append it to 279, then repeat: 2794 / 887

Step 6:
887 goes into 2794 3 times with a remainder of 133.
The next digit of our result is 3. 
Result so far: 973.0
Subtract 2661 from 2794 to get 133.
Include the next digit (0) from the dividend after 133, then repeat: 1330 / 887

On to step 7:
The number 887 fits into 1330 1 times, leaving a remainder of 443.
Write down 1 as next digit of the result. 
Result so far: 9731.0
Deduct 887 from 1330 and we're left with 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Advancing to step 8:
4430 divided by 887 is 4 with a remainder of 882.
The next digit of our result is 4. 
Result so far: 9731.4
Deduct 3548 from 4430 and we're left with 882.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8820, and continue the process.

On to step 9:
887 can be fit into 8820 9 times, resulting in a remainder of 837.
Write down 9 as next digit of the result. 
Result so far: 9731.49
The remainder is 837 after subtracting 7983 from 8820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8370, and continue the process.

Let's proceed to step 10:
887 goes into 8370 9 times with a remainder of 387.
Use 9 as the next digit of our solution. 
Result so far: 9731.499
Subtracting 7983 from 8370 leaves us with 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

The final result is 9731.499 with a remainder of 0.0387.