Finding the Fourth Proportional to 13,185.55, 18,196.09 and 7,217.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.55 : 18,196.09 = 7,217.60 : x
2. Step 2: Convert to fraction form
   13,185.55/18,196.09 = 7,217.60/x
3. Step 3: Cross multiply
   13,185.55x = 18,196.09 × 7,217.60
4. Step 4: Simplify right side
   13,185.55x = 131,332,092.51
5. Step 5: Solve for x
   x = 131,332,092.51/13,185.55
6. Step 6: Final answer
   x = 9,960.30