Step 1:
The first step to converting 1572.990366593 to a fraction is to re-write 1572.990366593 in the form p/q where p and q are both positive integers. To start with, 1572.990366593 can be written as simply 1572.990366593/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 1572.990366593, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 1572.990366593/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 1572.990366593/1 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 1572.990366593 as a fraction:
162018/103 / 1