Step 1:
The first step to converting 242.78813609729 to a fraction is to re-write 242.78813609729 in the form p/q where p and q are both positive integers. To start with, 242.78813609729 can be written as simply 242.78813609729/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 242.78813609729, which in this case is 11. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 242.78813609729/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 242.78813609729/1 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 242.78813609729 as a fraction:
20637/85 / 1