We're dividing 851868 by 4 
The aim is to understand the frequency of 4 in 851868.

Let's proceed to step 1:
The number 4 fits into 8 2 times, leaving a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 8 from 8 to get 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 4

Advancing to step 2:
4 can be fit into 5 1 times, resulting in a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Subtracting 4 from 5 leaves us with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 4

Step 3:
4 goes into 11 2 times with a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 212.0
Deduct 8 from 11 and we're left with 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 4

Step 4:
If we divide 38 by 4, we get 9 and a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 2129.0
If we take 36 away from 38, we end up with 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 4

Step 5:
If we divide 26 by 4, we get 6 and a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 21296.0
Deduct 24 from 26 and we're left with 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 4

Step 6:
If we divide 28 by 4, we get 7 and a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 212967.0
Subtracting 28 from 28 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
When dividing 0 by 4, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 212967.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
If we divide 0 by 4, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 212967.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 212967.0, with a leftover of 0.0.