We look at the division of 76394281 by 781 
The aim is to understand the frequency of 781 in 76394281.

Let's proceed to step 1:
When dividing 7 by 781, we get 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 781

Advancing to step 2:
The number 781 fits into 76 0 times, leaving a remainder of 76.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 76 and we're left with 76.
Take the next digit (3) from the dividend and append it to 76, then repeat: 763 / 781

On to step 3:
781 goes into 763 0 times with a remainder of 763.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 763, we get 763.
Bring next digit (9) of the dividend behind the 763 and repeat the process: 7639 / 781

Moving on to step 4:
781 goes into 7639 9 times with a remainder of 610.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtracting 7029 from 7639 leaves us with 610.
Grab the next digit (4) from the dividend, add it to 610, then carry on: 6104 / 781

Moving on to step 5:
If we divide 6104 by 781, we get 7 and a remainder of 637.
The number 7 becomes the next digit in our result. 
Result so far: 97.0
Subtracting 5467 from 6104 leaves us with 637.
Fetch the next digit (2) from the dividend, attach it to 637 and continue: 6372 / 781

Step 6:
When dividing 6372 by 781, we get 8 with a remainder of 124.
Write down 8 as next digit of the result. 
Result so far: 978.0
Subtracting 6248 from 6372 leaves us with 124.
Grab the next digit (8) from the dividend, add it to 124, then carry on: 1248 / 781

Step 7:
When dividing 1248 by 781, we get 1 with a remainder of 467.
Write down 1 as next digit of the result. 
Result so far: 9781.0
If we subtract 781 from 1248, we get 467.
Fetch the next digit (1) from the dividend, attach it to 467 and continue: 4671 / 781

Moving on to step 8:
4671 divided by 781 is 5 with a remainder of 766.
Record the quotient 5 as the next digit in the result. 
Result so far: 97815.0
If we take 3905 away from 4671, we end up with 766.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7660, and continue the process.

Let's proceed to step 9:
When dividing 7660 by 781, we get 9 with a remainder of 631.
The next digit of our result is 9. 
Result so far: 97815.9
The remainder is 631 after subtracting 7029 from 7660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6310, and continue the process.

Moving on to step 10:
781 can be fit into 6310 8 times, resulting in a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 97815.98
Deduct 6248 from 6310 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 11:
781 goes into 620 0 times with a remainder of 620.
Put 0 as the next digit of the answer. 
Result so far: 97815.98
The remainder is 620 after subtracting 0 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Advancing to step 12:
If we divide 6200 by 781, we get 7 and a remainder of 733.
The next digit of our result is 7. 
Result so far: 97815.9807
Subtract 5467 from 6200 to get 733.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7330, and continue the process.

On to step 13:
If we divide 7330 by 781, we get 9 and a remainder of 301.
Record the quotient 9 as the next digit in the result. 
Result so far: 97815.98079
If we subtract 7029 from 7330, we get 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Step 14:
If we divide 3010 by 781, we get 3 and a remainder of 667.
The next digit of our result is 3. 
Result so far: 97815.980793
If we subtract 2343 from 3010, we get 667.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6670, and continue the process.

Moving on to step 15:
6670 divided by 781 is 8 with a remainder of 422.
Use 8 as the next digit of our solution. 
Result so far: 97815.9807938
Deduct 6248 from 6670 and we're left with 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Step 16:
The number 781 fits into 4220 5 times, leaving a remainder of 315.
Put 5 as the next digit of the answer. 
Result so far: 97815.98079385
If we subtract 3905 from 4220, we get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

The final outcome is 97815.98079385, with a leftover of 3.15e-07.