Finding the Fourth Proportional to 13,185.57, 18,196.07 and 7,217.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,185.57 : 18,196.07 = 7,217.24 : x
2. Step 2: Convert to fraction form
   13,185.57/18,196.07 = 7,217.24/x
3. Step 3: Cross multiply
   13,185.57x = 18,196.07 × 7,217.24
4. Step 4: Simplify right side
   13,185.57x = 131,325,277.18
5. Step 5: Solve for x
   x = 131,325,277.18/13,185.57
6. Step 6: Final answer
   x = 9,959.77