We're dividing 10372868 by 409 
The aim is to understand the frequency of 409 in 10372868.

Moving on to step 1:
409 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 409

Advancing to step 2:
409 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 409

Moving on to step 3:
409 can be fit into 103 0 times, resulting in a remainder of 103.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 103, we get 103.
Append the next digit (7) from the dividend to 103 and continue with: 1037 / 409

Step 4:
The number 409 fits into 1037 2 times, leaving a remainder of 219.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 818 from 1037 leaves us with 219.
Append the next digit (2) from the dividend to 219 and continue with: 2192 / 409

Moving on to step 5:
409 can be fit into 2192 5 times, resulting in a remainder of 147.
Use 5 as the next digit of our solution. 
Result so far: 25.0
Subtracting 2045 from 2192 leaves us with 147.
Take the next digit (8) from the dividend and append it to 147, then repeat: 1478 / 409

On to step 6:
1478 divided by 409 is 3 with a remainder of 251.
Put 3 as the next digit of the answer. 
Result so far: 253.0
Subtract 1227 from 1478 to get 251.
Fetch the next digit (6) from the dividend, attach it to 251 and continue: 2516 / 409

Moving on to step 7:
When dividing 2516 by 409, we get 6 with a remainder of 62.
Use 6 as the next digit of our solution. 
Result so far: 2536.0
The remainder is 62 after subtracting 2454 from 2516.
Grab the next digit (8) from the dividend, add it to 62, then carry on: 628 / 409

Moving on to step 8:
409 can be fit into 628 1 times, resulting in a remainder of 219.
Put 1 as the next digit of the answer. 
Result so far: 25361.0
If we take 409 away from 628, we end up with 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Let's proceed to step 9:
The number 409 fits into 2190 5 times, leaving a remainder of 145.
Use 5 as the next digit of our solution. 
Result so far: 25361.5
Subtracting 2045 from 2190 leaves us with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Let's proceed to step 10:
The number 409 fits into 1450 3 times, leaving a remainder of 223.
Record the quotient 3 as the next digit in the result. 
Result so far: 25361.53
The remainder is 223 after subtracting 1227 from 1450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2230, and continue the process.

Advancing to step 11:
When dividing 2230 by 409, we get 5 with a remainder of 185.
The number 5 becomes the next digit in our result. 
Result so far: 25361.535
Deduct 2045 from 2230 and we're left with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Let's proceed to step 12:
1850 divided by 409 is 4 with a remainder of 214.
Record the quotient 4 as the next digit in the result. 
Result so far: 25361.5354
If we subtract 1636 from 1850, we get 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Step 13:
2140 divided by 409 is 5 with a remainder of 95.
Put 5 as the next digit of the answer. 
Result so far: 25361.53545
Subtract 2045 from 2140 to get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Step 14:
The number 409 fits into 950 2 times, leaving a remainder of 132.
Put 2 as the next digit of the answer. 
Result so far: 25361.535452
Subtracting 818 from 950 leaves us with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Let's proceed to step 15:
The number 409 fits into 1320 3 times, leaving a remainder of 93.
Put 3 as the next digit of the answer. 
Result so far: 25361.5354523
Deduct 1227 from 1320 and we're left with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Step 16:
The number 409 fits into 930 2 times, leaving a remainder of 112.
Record the quotient 2 as the next digit in the result. 
Result so far: 25361.53545232
Subtracting 818 from 930 leaves us with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Our division results in 25361.53545232 with a remaining 1.12e-07.