We look at the division of 3697307 by 978 
The aim is to understand the frequency of 978 in 3697307.

On to step 1:
The number 978 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 978

Advancing to step 2:
When dividing 36 by 978, we get 0 with a remainder of 36.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 36 and we're left with 36.
Bring next digit (9) of the dividend behind the 36 and repeat the process: 369 / 978

Step 3:
978 goes into 369 0 times with a remainder of 369.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 369 to get 369.
Grab the next digit (7) from the dividend, add it to 369, then carry on: 3697 / 978

Advancing to step 4:
978 can be fit into 3697 3 times, resulting in a remainder of 763.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 2934 away from 3697, we end up with 763.
Grab the next digit (3) from the dividend, add it to 763, then carry on: 7633 / 978

Advancing to step 5:
The number 978 fits into 7633 7 times, leaving a remainder of 787.
The next digit of our result is 7. 
Result so far: 37.0
Deduct 6846 from 7633 and we're left with 787.
Include the next digit (0) from the dividend after 787, then repeat: 7870 / 978

Let's proceed to step 6:
The number 978 fits into 7870 8 times, leaving a remainder of 46.
Use 8 as the next digit of our solution. 
Result so far: 378.0
The remainder is 46 after subtracting 7824 from 7870.
Append the next digit (7) from the dividend to 46 and continue with: 467 / 978

On to step 7:
467 divided by 978 is 0 with a remainder of 467.
Use 0 as the next digit of our solution. 
Result so far: 3780.0
Subtracting 0 from 467 leaves us with 467.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4670, and continue the process.

Step 8:
4670 divided by 978 is 4 with a remainder of 758.
The number 4 becomes the next digit in our result. 
Result so far: 3780.4
If we take 3912 away from 4670, we end up with 758.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7580, and continue the process.

Advancing to step 9:
If we divide 7580 by 978, we get 7 and a remainder of 734.
Record the quotient 7 as the next digit in the result. 
Result so far: 3780.47
The remainder is 734 after subtracting 6846 from 7580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7340, and continue the process.

Moving on to step 10:
978 can be fit into 7340 7 times, resulting in a remainder of 494.
The number 7 becomes the next digit in our result. 
Result so far: 3780.477
Subtract 6846 from 7340 to get 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

The final result is 3780.477 with a remainder of 0.0494.