We look at the division of 29190561 by 428 
The aim is to understand the frequency of 428 in 29190561.

Advancing to step 1:
When dividing 2 by 428, we get 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 428

Going ahead to step 2:
428 goes into 29 0 times with a remainder of 29.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 29 leaves us with 29.
Take the next digit (1) from the dividend and append it to 29, then repeat: 291 / 428

Moving on to step 3:
428 goes into 291 0 times with a remainder of 291.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 291 leaves us with 291.
Fetch the next digit (9) from the dividend, attach it to 291 and continue: 2919 / 428

Moving on to step 4:
428 goes into 2919 6 times with a remainder of 351.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 351 after subtracting 2568 from 2919.
Bring next digit (0) of the dividend behind the 351 and repeat the process: 3510 / 428

Let's proceed to step 5:
428 goes into 3510 8 times with a remainder of 86.
The number 8 becomes the next digit in our result. 
Result so far: 68.0
If we subtract 3424 from 3510, we get 86.
Grab the next digit (5) from the dividend, add it to 86, then carry on: 865 / 428

Moving on to step 6:
If we divide 865 by 428, we get 2 and a remainder of 9.
The next digit of our result is 2. 
Result so far: 682.0
Subtracting 856 from 865 leaves us with 9.
Fetch the next digit (6) from the dividend, attach it to 9 and continue: 96 / 428

Moving on to step 7:
The number 428 fits into 96 0 times, leaving a remainder of 96.
Use 0 as the next digit of our solution. 
Result so far: 6820.0
If we subtract 0 from 96, we get 96.
Fetch the next digit (1) from the dividend, attach it to 96 and continue: 961 / 428

Going ahead to step 8:
428 goes into 961 2 times with a remainder of 105.
Use 2 as the next digit of our solution. 
Result so far: 68202.0
Subtract 856 from 961 to get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Advancing to step 9:
428 goes into 1050 2 times with a remainder of 194.
Record the quotient 2 as the next digit in the result. 
Result so far: 68202.2
Subtract 856 from 1050 to get 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Going ahead to step 10:
1940 divided by 428 is 4 with a remainder of 228.
Put 4 as the next digit of the answer. 
Result so far: 68202.24
If we subtract 1712 from 1940, we get 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Going ahead to step 11:
The number 428 fits into 2280 5 times, leaving a remainder of 140.
Record the quotient 5 as the next digit in the result. 
Result so far: 68202.245
Deduct 2140 from 2280 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 12:
If we divide 1400 by 428, we get 3 and a remainder of 116.
Put 3 as the next digit of the answer. 
Result so far: 68202.2453
Subtract 1284 from 1400 to get 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Moving on to step 13:
If we divide 1160 by 428, we get 2 and a remainder of 304.
Write down 2 as next digit of the result. 
Result so far: 68202.24532
Subtracting 856 from 1160 leaves us with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

Going ahead to step 14:
428 can be fit into 3040 7 times, resulting in a remainder of 44.
Use 7 as the next digit of our solution. 
Result so far: 68202.245327
The remainder is 44 after subtracting 2996 from 3040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 15:
440 divided by 428 is 1 with a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 68202.2453271
If we subtract 428 from 440, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 16:
120 divided by 428 is 0 with a remainder of 120.
The number 0 becomes the next digit in our result. 
Result so far: 68202.2453271
Subtract 0 from 120 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

The final outcome is 68202.2453271, with a leftover of 1.2e-07.