We look at the division of 38646417 by 780 
The aim is to understand the frequency of 780 in 38646417.

On to step 1:
When dividing 3 by 780, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 780

Let's proceed to step 2:
780 goes into 38 0 times with a remainder of 38.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 38 to get 38.
Take the next digit (6) from the dividend and append it to 38, then repeat: 386 / 780

Going ahead to step 3:
When dividing 386 by 780, we get 0 with a remainder of 386.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 386 to get 386.
Take the next digit (4) from the dividend and append it to 386, then repeat: 3864 / 780

Going ahead to step 4:
The number 780 fits into 3864 4 times, leaving a remainder of 744.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 3120 from 3864, we get 744.
Grab the next digit (6) from the dividend, add it to 744, then carry on: 7446 / 780

Moving on to step 5:
780 goes into 7446 9 times with a remainder of 426.
Record the quotient 9 as the next digit in the result. 
Result so far: 49.0
Subtracting 7020 from 7446 leaves us with 426.
Fetch the next digit (4) from the dividend, attach it to 426 and continue: 4264 / 780

On to step 6:
The number 780 fits into 4264 5 times, leaving a remainder of 364.
Put 5 as the next digit of the answer. 
Result so far: 495.0
If we subtract 3900 from 4264, we get 364.
Append the next digit (1) from the dividend to 364 and continue with: 3641 / 780

Going ahead to step 7:
If we divide 3641 by 780, we get 4 and a remainder of 521.
The number 4 becomes the next digit in our result. 
Result so far: 4954.0
The remainder is 521 after subtracting 3120 from 3641.
Grab the next digit (7) from the dividend, add it to 521, then carry on: 5217 / 780

Advancing to step 8:
The number 780 fits into 5217 6 times, leaving a remainder of 537.
Write down 6 as next digit of the result. 
Result so far: 49546.0
Subtract 4680 from 5217 to get 537.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5370, and continue the process.

Moving on to step 9:
780 can be fit into 5370 6 times, resulting in a remainder of 690.
Put 6 as the next digit of the answer. 
Result so far: 49546.6
The remainder is 690 after subtracting 4680 from 5370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6900, and continue the process.

Going ahead to step 10:
780 goes into 6900 8 times with a remainder of 660.
Use 8 as the next digit of our solution. 
Result so far: 49546.68
The remainder is 660 after subtracting 6240 from 6900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6600, and continue the process.

Moving on to step 11:
6600 divided by 780 is 8 with a remainder of 360.
Use 8 as the next digit of our solution. 
Result so far: 49546.688
The remainder is 360 after subtracting 6240 from 6600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

After the division, we end up with 49546.688 and a remainder of 0.036.