We look at the division of 43458687 by 403 
The aim is to understand the frequency of 403 in 43458687.

Advancing to step 1:
The number 403 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 403

Going ahead to step 2:
403 can be fit into 43 0 times, resulting in a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 43 and we're left with 43.
Fetch the next digit (4) from the dividend, attach it to 43 and continue: 434 / 403

Moving on to step 3:
434 divided by 403 is 1 with a remainder of 31.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 403 from 434, we get 31.
Take the next digit (5) from the dividend and append it to 31, then repeat: 315 / 403

Let's proceed to step 4:
When dividing 315 by 403, we get 0 with a remainder of 315.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
The remainder is 315 after subtracting 0 from 315.
Grab the next digit (8) from the dividend, add it to 315, then carry on: 3158 / 403

Advancing to step 5:
403 can be fit into 3158 7 times, resulting in a remainder of 337.
Record the quotient 7 as the next digit in the result. 
Result so far: 107.0
If we take 2821 away from 3158, we end up with 337.
Fetch the next digit (6) from the dividend, attach it to 337 and continue: 3376 / 403

Advancing to step 6:
403 can be fit into 3376 8 times, resulting in a remainder of 152.
Put 8 as the next digit of the answer. 
Result so far: 1078.0
Subtracting 3224 from 3376 leaves us with 152.
Include the next digit (8) from the dividend after 152, then repeat: 1528 / 403

Advancing to step 7:
If we divide 1528 by 403, we get 3 and a remainder of 319.
Record the quotient 3 as the next digit in the result. 
Result so far: 10783.0
Deduct 1209 from 1528 and we're left with 319.
Append the next digit (7) from the dividend to 319 and continue with: 3197 / 403

Step 8:
403 can be fit into 3197 7 times, resulting in a remainder of 376.
Write down 7 as next digit of the result. 
Result so far: 107837.0
The remainder is 376 after subtracting 2821 from 3197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Let's proceed to step 9:
The number 403 fits into 3760 9 times, leaving a remainder of 133.
Write down 9 as next digit of the result. 
Result so far: 107837.9
The remainder is 133 after subtracting 3627 from 3760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1330, and continue the process.

On to step 10:
When dividing 1330 by 403, we get 3 with a remainder of 121.
Record the quotient 3 as the next digit in the result. 
Result so far: 107837.93
Subtract 1209 from 1330 to get 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Going ahead to step 11:
When dividing 1210 by 403, we get 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 107837.933
Subtract 1209 from 1210 to 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.

In conclusion, the division gives 107837.933 with a balance of 0.0001.