Step 1:
The first step to converting 1099.9978915533 to a fraction is to re-write 1099.9978915533 in the form p/q where p and q are both positive integers. To start with, 1099.9978915533 can be written as simply 1099.9978915533/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 1099.9978915533, which in this case is 10. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 1099.9978915533/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 1099.9978915533/1 each by 10000000000:
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 1099.9978915533 as a fraction:
521399/474 / 1