We look at the division of 902331 by 19 
The aim is to understand the frequency of 19 in 902331.

On to step 1:
The number 19 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 19

Step 2:
90 divided by 19 is 4 with a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we subtract 76 from 90, we get 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 19

Moving on to step 3:
19 goes into 142 7 times with a remainder of 9.
Use 7 as the next digit of our solution. 
Result so far: 47.0
Deduct 133 from 142 and we're left with 9.
Append the next digit (3) from the dividend to 9 and continue with: 93 / 19

Step 4:
93 divided by 19 is 4 with a remainder of 17.
Write down 4 as next digit of the result. 
Result so far: 474.0
If we take 76 away from 93, we end up with 17.
Take the next digit (3) from the dividend and append it to 17, then repeat: 173 / 19

Let's proceed to step 5:
19 goes into 173 9 times with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 4749.0
If we subtract 171 from 173, we get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 19

Advancing to step 6:
If we divide 21 by 19, we get 1 and a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 47491.0
If we subtract 19 from 21, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
19 can be fit into 20 1 times, resulting in a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 47491.1
If we subtract 19 from 20, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 8:
19 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 47491.1
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
The number 19 fits into 100 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 47491.105
The remainder is 5 after subtracting 95 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 10:
19 can be fit into 50 2 times, resulting in a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 47491.1052
If we take 38 away from 50, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 11:
If we divide 120 by 19, we get 6 and a remainder of 6.
The next digit of our result is 6. 
Result so far: 47491.10526
Deduct 114 from 120 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 12:
19 goes into 60 3 times with a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 47491.105263
The remainder is 3 after subtracting 57 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
19 can be fit into 30 1 times, resulting in a remainder of 11.
The next digit of our result is 1. 
Result so far: 47491.1052631
If we subtract 19 from 30, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 14:
When dividing 110 by 19, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 47491.10526315
If we subtract 95 from 110, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 47491.10526315 with a remainder of 1.5e-08.