We look at the division of 21213718 by 786 
The aim is to understand the frequency of 786 in 21213718.

Moving on to step 1:
786 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 786

Advancing to step 2:
The number 786 fits into 21 0 times, leaving a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Grab the next digit (2) from the dividend, add it to 21, then carry on: 212 / 786

On to step 3:
786 goes into 212 0 times with a remainder of 212.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 212 leaves us with 212.
Fetch the next digit (1) from the dividend, attach it to 212 and continue: 2121 / 786

Advancing to step 4:
786 can be fit into 2121 2 times, resulting in a remainder of 549.
The next digit of our result is 2. 
Result so far: 2.0
If we take 1572 away from 2121, we end up with 549.
Append the next digit (3) from the dividend to 549 and continue with: 5493 / 786

Advancing to step 5:
786 can be fit into 5493 6 times, resulting in a remainder of 777.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
The remainder is 777 after subtracting 4716 from 5493.
Grab the next digit (7) from the dividend, add it to 777, then carry on: 7777 / 786

Step 6:
7777 divided by 786 is 9 with a remainder of 703.
Write down 9 as next digit of the result. 
Result so far: 269.0
Subtracting 7074 from 7777 leaves us with 703.
Fetch the next digit (1) from the dividend, attach it to 703 and continue: 7031 / 786

Advancing to step 7:
786 goes into 7031 8 times with a remainder of 743.
Use 8 as the next digit of our solution. 
Result so far: 2698.0
Subtract 6288 from 7031 to get 743.
Bring next digit (8) of the dividend behind the 743 and repeat the process: 7438 / 786

Going ahead to step 8:
When dividing 7438 by 786, we get 9 with a remainder of 364.
Use 9 as the next digit of our solution. 
Result so far: 26989.0
If we take 7074 away from 7438, we end up with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Advancing to step 9:
The number 786 fits into 3640 4 times, leaving a remainder of 496.
Record the quotient 4 as the next digit in the result. 
Result so far: 26989.4
The remainder is 496 after subtracting 3144 from 3640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

On to step 10:
4960 divided by 786 is 6 with a remainder of 244.
Write down 6 as next digit of the result. 
Result so far: 26989.46
Deduct 4716 from 4960 and we're left with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Advancing to step 11:
If we divide 2440 by 786, we get 3 and a remainder of 82.
The next digit of our result is 3. 
Result so far: 26989.463
Subtracting 2358 from 2440 leaves us with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 12:
786 can be fit into 820 1 times, resulting in a remainder of 34.
Use 1 as the next digit of our solution. 
Result so far: 26989.4631
If we subtract 786 from 820, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 13:
If we divide 340 by 786, we get 0 and a remainder of 340.
Record the quotient 0 as the next digit in the result. 
Result so far: 26989.4631
Deduct 0 from 340 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Going ahead to step 14:
3400 divided by 786 is 4 with a remainder of 256.
Use 4 as the next digit of our solution. 
Result so far: 26989.463104
If we take 3144 away from 3400, we end up with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Going ahead to step 15:
When dividing 2560 by 786, we get 3 with a remainder of 202.
Use 3 as the next digit of our solution. 
Result so far: 26989.4631043
Subtract 2358 from 2560 to get 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Step 16:
When dividing 2020 by 786, we get 2 with a remainder of 448.
The number 2 becomes the next digit in our result. 
Result so far: 26989.46310432
If we take 1572 away from 2020, we end up with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

In conclusion, the division gives 26989.46310432 with a balance of 4.48e-07.