Step 1:
The first step to converting 3644.686687818 to a fraction is to re-write 3644.686687818 in the form p/q where p and q are both positive integers. To start with, 3644.686687818 can be written as simply 3644.686687818/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 3644.686687818, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 3644.686687818/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 3644.686687818/1 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 3644.686687818 as a fraction:
58315/16 / 1