We look at the division of 78717589 by 907 
The aim is to understand the frequency of 907 in 78717589.

Moving on to step 1:
The number 907 fits into 7 0 times, leaving a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 907

Advancing to step 2:
78 divided by 907 is 0 with a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 78, we get 78.
Fetch the next digit (7) from the dividend, attach it to 78 and continue: 787 / 907

Moving on to step 3:
When dividing 787 by 907, we get 0 with a remainder of 787.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 787, we get 787.
Append the next digit (1) from the dividend to 787 and continue with: 7871 / 907

Going ahead to step 4:
907 can be fit into 7871 8 times, resulting in a remainder of 615.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 7256 from 7871 and we're left with 615.
Include the next digit (7) from the dividend after 615, then repeat: 6157 / 907

Going ahead to step 5:
907 can be fit into 6157 6 times, resulting in a remainder of 715.
Put 6 as the next digit of the answer. 
Result so far: 86.0
Subtracting 5442 from 6157 leaves us with 715.
Grab the next digit (5) from the dividend, add it to 715, then carry on: 7155 / 907

Step 6:
7155 divided by 907 is 7 with a remainder of 806.
The next digit of our result is 7. 
Result so far: 867.0
If we subtract 6349 from 7155, we get 806.
Append the next digit (8) from the dividend to 806 and continue with: 8068 / 907

Advancing to step 7:
The number 907 fits into 8068 8 times, leaving a remainder of 812.
Put 8 as the next digit of the answer. 
Result so far: 8678.0
Deduct 7256 from 8068 and we're left with 812.
Bring next digit (9) of the dividend behind the 812 and repeat the process: 8129 / 907

On to step 8:
907 can be fit into 8129 8 times, resulting in a remainder of 873.
Record the quotient 8 as the next digit in the result. 
Result so far: 86788.0
Deduct 7256 from 8129 and we're left with 873.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8730, and continue the process.

Advancing to step 9:
When dividing 8730 by 907, we get 9 with a remainder of 567.
The next digit of our result is 9. 
Result so far: 86788.9
Subtracting 8163 from 8730 leaves us with 567.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5670, and continue the process.

Moving on to step 10:
If we divide 5670 by 907, we get 6 and a remainder of 228.
The next digit of our result is 6. 
Result so far: 86788.96
Subtracting 5442 from 5670 leaves us with 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

On to step 11:
The number 907 fits into 2280 2 times, leaving a remainder of 466.
Use 2 as the next digit of our solution. 
Result so far: 86788.962
If we take 1814 away from 2280, we end up with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

Step 12:
907 can be fit into 4660 5 times, resulting in a remainder of 125.
Put 5 as the next digit of the answer. 
Result so far: 86788.9625
Subtract 4535 from 4660 to get 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

On to step 13:
907 goes into 1250 1 times with a remainder of 343.
Put 1 as the next digit of the answer. 
Result so far: 86788.96251
Deduct 907 from 1250 and we're left with 343.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3430, and continue the process.

On to step 14:
The number 907 fits into 3430 3 times, leaving a remainder of 709.
The next digit of our result is 3. 
Result so far: 86788.962513
Subtracting 2721 from 3430 leaves us with 709.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7090, and continue the process.

Step 15:
The number 907 fits into 7090 7 times, leaving a remainder of 741.
Record the quotient 7 as the next digit in the result. 
Result so far: 86788.9625137
The remainder is 741 after subtracting 6349 from 7090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7410, and continue the process.

Advancing to step 16:
If we divide 7410 by 907, we get 8 and a remainder of 154.
Record the quotient 8 as the next digit in the result. 
Result so far: 86788.96251378
The remainder is 154 after subtracting 7256 from 7410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

After the division, we end up with 86788.96251378 and a remainder of 1.54e-07.