Step 1:
The first step to converting 3545.643 to a fraction is to re-write 3545.643 in the form p/q where p and q are both positive integers. To start with, 3545.643 can be written as simply 3545.643/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 3545.643, which in this case is 3. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 3545.643/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 3545.643/1 each by 1000:
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 3545.643 as a fraction:
49639/14 / 1