Step 1:
The first step to converting 11409.145811218 to a fraction is to re-write 11409.145811218 in the form p/q where p and q are both positive integers. To start with, 11409.145811218 can be written as simply 11409.145811218/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 11409.145811218, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 11409.145811218/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 11409.145811218/1 each by 1000000000:
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 11409.145811218 as a fraction:
79864/7 / 1