12355286 divided by 266 
We want to figure out the number of times 12355286 can be divided by 266.

On to step 1:
If we divide 1 by 266, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 266

Advancing to step 2:
266 goes into 12 0 times with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 266

On to step 3:
123 divided by 266 is 0 with a remainder of 123.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 123 after subtracting 0 from 123.
Take the next digit (5) from the dividend and append it to 123, then repeat: 1235 / 266

On to step 4:
If we divide 1235 by 266, we get 4 and a remainder of 171.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 1064 from 1235 to get 171.
Bring next digit (5) of the dividend behind the 171 and repeat the process: 1715 / 266

On to step 5:
266 goes into 1715 6 times with a remainder of 119.
Record the quotient 6 as the next digit in the result. 
Result so far: 46.0
Subtract 1596 from 1715 to get 119.
Append the next digit (2) from the dividend to 119 and continue with: 1192 / 266

Going ahead to step 6:
266 can be fit into 1192 4 times, resulting in a remainder of 128.
The next digit of our result is 4. 
Result so far: 464.0
Deduct 1064 from 1192 and we're left with 128.
Fetch the next digit (8) from the dividend, attach it to 128 and continue: 1288 / 266

Going ahead to step 7:
The number 266 fits into 1288 4 times, leaving a remainder of 224.
Use 4 as the next digit of our solution. 
Result so far: 4644.0
Subtract 1064 from 1288 to get 224.
Grab the next digit (6) from the dividend, add it to 224, then carry on: 2246 / 266

On to step 8:
2246 divided by 266 is 8 with a remainder of 118.
Put 8 as the next digit of the answer. 
Result so far: 46448.0
If we take 2128 away from 2246, we end up with 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

Let's proceed to step 9:
The number 266 fits into 1180 4 times, leaving a remainder of 116.
The number 4 becomes the next digit in our result. 
Result so far: 46448.4
The remainder is 116 after subtracting 1064 from 1180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

Going ahead to step 10:
If we divide 1160 by 266, we get 4 and a remainder of 96.
Write down 4 as next digit of the result. 
Result so far: 46448.44
Deduct 1064 from 1160 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

In conclusion, the division gives 46448.44 with a balance of 0.096.