Step 1:
The first step to converting 266290343.78361 to a fraction is to re-write 266290343.78361 in the form p/q where p and q are both positive integers. To start with, 266290343.78361 can be written as simply 266290343.78361/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 266290343.78361, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 266290343.78361/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 266290343.78361/1 each by 100000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 266290343.78361 as a fraction:
266290343/1 / 1