Finding the Fourth Proportional to 12,132.24, 18,207 and 5,208.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,132.24 : 18,207 = 5,208.72 : x
2. Step 2: Convert to fraction form
   12,132.24/18,207 = 5,208.72/x
3. Step 3: Cross multiply
   12,132.24x = 18,207 × 5,208.72
4. Step 4: Simplify right side
   12,132.24x = 94,835,165.04
5. Step 5: Solve for x
   x = 94,835,165.04/12,132.24
6. Step 6: Final answer
   x = 7,816.79