We're dividing 19964401 by 387 
The aim is to understand the frequency of 387 in 19964401.

Step 1:
387 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 387

Step 2:
387 goes into 19 0 times with a remainder of 19.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 19 and we're left with 19.
Append the next digit (9) from the dividend to 19 and continue with: 199 / 387

Let's proceed to step 3:
387 goes into 199 0 times with a remainder of 199.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 199 leaves us with 199.
Take the next digit (6) from the dividend and append it to 199, then repeat: 1996 / 387

Step 4:
If we divide 1996 by 387, we get 5 and a remainder of 61.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Subtract 1935 from 1996 to get 61.
Take the next digit (4) from the dividend and append it to 61, then repeat: 614 / 387

On to step 5:
If we divide 614 by 387, we get 1 and a remainder of 227.
Use 1 as the next digit of our solution. 
Result so far: 51.0
The remainder is 227 after subtracting 387 from 614.
Take the next digit (4) from the dividend and append it to 227, then repeat: 2274 / 387

Moving on to step 6:
The number 387 fits into 2274 5 times, leaving a remainder of 339.
Record the quotient 5 as the next digit in the result. 
Result so far: 515.0
Subtracting 1935 from 2274 leaves us with 339.
Fetch the next digit (0) from the dividend, attach it to 339 and continue: 3390 / 387

Going ahead to step 7:
3390 divided by 387 is 8 with a remainder of 294.
The number 8 becomes the next digit in our result. 
Result so far: 5158.0
If we subtract 3096 from 3390, we get 294.
Grab the next digit (1) from the dividend, add it to 294, then carry on: 2941 / 387

On to step 8:
If we divide 2941 by 387, we get 7 and a remainder of 232.
The next digit of our result is 7. 
Result so far: 51587.0
If we subtract 2709 from 2941, we get 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Moving on to step 9:
387 can be fit into 2320 5 times, resulting in a remainder of 385.
Record the quotient 5 as the next digit in the result. 
Result so far: 51587.5
Subtracting 1935 from 2320 leaves us with 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Going ahead to step 10:
If we divide 3850 by 387, we get 9 and a remainder of 367.
Record the quotient 9 as the next digit in the result. 
Result so far: 51587.59
Subtract 3483 from 3850 to get 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Let's proceed to step 11:
When dividing 3670 by 387, we get 9 with a remainder of 187.
Put 9 as the next digit of the answer. 
Result so far: 51587.599
The remainder is 187 after subtracting 3483 from 3670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

The final outcome is 51587.599, with a leftover of 0.0187.