Finding the Fourth Proportional to 12,661.17, 17,477.27 and 11,332.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.17 : 17,477.27 = 11,332.50 : x
2. Step 2: Convert to fraction form
   12,661.17/17,477.27 = 11,332.50/x
3. Step 3: Cross multiply
   12,661.17x = 17,477.27 × 11,332.50
4. Step 4: Simplify right side
   12,661.17x = 198,061,162.28
5. Step 5: Solve for x
   x = 198,061,162.28/12,661.17
6. Step 6: Final answer
   x = 15,643.20