We look at the division of 78493478 by 604 
The aim is to understand the frequency of 604 in 78493478.

On to step 1:
If we divide 7 by 604, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Grab the next digit (8) from the dividend, add it to 7, then carry on: 78 / 604

Step 2:
78 divided by 604 is 0 with a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Bring next digit (4) of the dividend behind the 78 and repeat the process: 784 / 604

Going ahead to step 3:
784 divided by 604 is 1 with a remainder of 180.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 604 from 784 leaves us with 180.
Fetch the next digit (9) from the dividend, attach it to 180 and continue: 1809 / 604

Going ahead to step 4:
When dividing 1809 by 604, we get 2 with a remainder of 601.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
If we subtract 1208 from 1809, we get 601.
Bring next digit (3) of the dividend behind the 601 and repeat the process: 6013 / 604

Advancing to step 5:
If we divide 6013 by 604, we get 9 and a remainder of 577.
Record the quotient 9 as the next digit in the result. 
Result so far: 129.0
The remainder is 577 after subtracting 5436 from 6013.
Append the next digit (4) from the dividend to 577 and continue with: 5774 / 604

Advancing to step 6:
604 can be fit into 5774 9 times, resulting in a remainder of 338.
Write down 9 as next digit of the result. 
Result so far: 1299.0
Subtract 5436 from 5774 to get 338.
Append the next digit (7) from the dividend to 338 and continue with: 3387 / 604

On to step 7:
The number 604 fits into 3387 5 times, leaving a remainder of 367.
Write down 5 as next digit of the result. 
Result so far: 12995.0
Deduct 3020 from 3387 and we're left with 367.
Fetch the next digit (8) from the dividend, attach it to 367 and continue: 3678 / 604

On to step 8:
604 can be fit into 3678 6 times, resulting in a remainder of 54.
The next digit of our result is 6. 
Result so far: 129956.0
The remainder is 54 after subtracting 3624 from 3678.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 9:
604 goes into 540 0 times with a remainder of 540.
Use 0 as the next digit of our solution. 
Result so far: 129956.0
Subtracting 0 from 540 leaves us with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Step 10:
If we divide 5400 by 604, we get 8 and a remainder of 568.
Put 8 as the next digit of the answer. 
Result so far: 129956.08
If we subtract 4832 from 5400, we get 568.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5680, and continue the process.

Step 11:
If we divide 5680 by 604, we get 9 and a remainder of 244.
The number 9 becomes the next digit in our result. 
Result so far: 129956.089
Subtract 5436 from 5680 to get 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Let's proceed to step 12:
604 can be fit into 2440 4 times, resulting in a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 129956.0894
If we take 2416 away from 2440, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 13:
The number 604 fits into 240 0 times, leaving a remainder of 240.
The number 0 becomes the next digit in our result. 
Result so far: 129956.0894
If we take 0 away from 240, we end up with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 14:
When dividing 2400 by 604, we get 3 with a remainder of 588.
Write down 3 as next digit of the result. 
Result so far: 129956.089403
If we subtract 1812 from 2400, we get 588.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5880, and continue the process.

Let's proceed to step 15:
When dividing 5880 by 604, we get 9 with a remainder of 444.
Write down 9 as next digit of the result. 
Result so far: 129956.0894039
Subtracting 5436 from 5880 leaves us with 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

On to step 16:
When dividing 4440 by 604, we get 7 with a remainder of 212.
The number 7 becomes the next digit in our result. 
Result so far: 129956.08940397
The remainder is 212 after subtracting 4228 from 4440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2120, and continue the process.

The final result is 129956.08940397 with a remainder of 2.12e-07.