Step 1:
The first step to converting 250.20431298678 to a fraction is to re-write 250.20431298678 in the form p/q where p and q are both positive integers. To start with, 250.20431298678 can be written as simply 250.20431298678/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 250.20431298678, which in this case is 11. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 250.20431298678/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 250.20431298678/1 each by 100000000000:
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 250.20431298678 as a fraction:
11009/44 / 1