Finding the Fourth Proportional to 12,831.98, 17,711.08 and 7,528.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,831.98 : 17,711.08 = 7,528.50 : x
2. Step 2: Convert to fraction form
   12,831.98/17,711.08 = 7,528.50/x
3. Step 3: Cross multiply
   12,831.98x = 17,711.08 × 7,528.50
4. Step 4: Simplify right side
   12,831.98x = 133,337,865.78
5. Step 5: Solve for x
   x = 133,337,865.78/12,831.98
6. Step 6: Final answer
   x = 10,391.06