Step 1:
The first step to converting 75109.78484813 to a fraction is to re-write 75109.78484813 in the form p/q where p and q are both positive integers. To start with, 75109.78484813 can be written as simply 75109.78484813/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 75109.78484813, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 75109.78484813/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 75109.78484813/1 each by 100000000:
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 75109.78484813 as a fraction:
300439/4 / 1