We look at the division of 91968843 by 781 
The aim is to understand the frequency of 781 in 91968843.

Advancing to step 1:
The number 781 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 781

Advancing to step 2:
91 divided by 781 is 0 with a remainder of 91.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 91 to get 91.
Take the next digit (9) from the dividend and append it to 91, then repeat: 919 / 781

On to step 3:
If we divide 919 by 781, we get 1 and a remainder of 138.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 781 from 919 and we're left with 138.
Fetch the next digit (6) from the dividend, attach it to 138 and continue: 1386 / 781

Step 4:
781 can be fit into 1386 1 times, resulting in a remainder of 605.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
If we take 781 away from 1386, we end up with 605.
Include the next digit (8) from the dividend after 605, then repeat: 6058 / 781

Let's proceed to step 5:
If we divide 6058 by 781, we get 7 and a remainder of 591.
The next digit of our result is 7. 
Result so far: 117.0
If we take 5467 away from 6058, we end up with 591.
Take the next digit (8) from the dividend and append it to 591, then repeat: 5918 / 781

On to step 6:
If we divide 5918 by 781, we get 7 and a remainder of 451.
The next digit of our result is 7. 
Result so far: 1177.0
If we take 5467 away from 5918, we end up with 451.
Fetch the next digit (4) from the dividend, attach it to 451 and continue: 4514 / 781

Advancing to step 7:
4514 divided by 781 is 5 with a remainder of 609.
Put 5 as the next digit of the answer. 
Result so far: 11775.0
Subtracting 3905 from 4514 leaves us with 609.
Take the next digit (3) from the dividend and append it to 609, then repeat: 6093 / 781

Going ahead to step 8:
If we divide 6093 by 781, we get 7 and a remainder of 626.
The number 7 becomes the next digit in our result. 
Result so far: 117757.0
Deduct 5467 from 6093 and we're left with 626.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6260, and continue the process.

Advancing to step 9:
6260 divided by 781 is 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 117757.8
Deduct 6248 from 6260 and we're left 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.

Advancing to step 10:
120 divided by 781 is 0 with a remainder of 120.
Record the quotient 0 as the next digit in the result. 
Result so far: 117757.8
If we subtract 0 from 120, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 11:
1200 divided by 781 is 1 with a remainder of 419.
Put 1 as the next digit of the answer. 
Result so far: 117757.801
If we take 781 away from 1200, we end up with 419.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4190, and continue the process.

Step 12:
4190 divided by 781 is 5 with a remainder of 285.
Write down 5 as next digit of the result. 
Result so far: 117757.8015
Subtracting 3905 from 4190 leaves us with 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

Step 13:
If we divide 2850 by 781, we get 3 and a remainder of 507.
Write down 3 as next digit of the result. 
Result so far: 117757.80153
Deduct 2343 from 2850 and we're left with 507.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5070, and continue the process.

On to step 14:
781 goes into 5070 6 times with a remainder of 384.
The number 6 becomes the next digit in our result. 
Result so far: 117757.801536
Subtracting 4686 from 5070 leaves us with 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

On to step 15:
If we divide 3840 by 781, we get 4 and a remainder of 716.
Record the quotient 4 as the next digit in the result. 
Result so far: 117757.8015364
Deduct 3124 from 3840 and we're left with 716.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7160, and continue the process.

On to step 16:
781 goes into 7160 9 times with a remainder of 131.
The next digit of our result is 9. 
Result so far: 117757.80153649
Deduct 7029 from 7160 and we're left with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

The final outcome is 117757.80153649, with a leftover of 1.31e-07.