Finding the Fourth Proportional to 12,299.31, 16,978.55 and 8,332.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,299.31 : 16,978.55 = 8,332.47 : x
2. Step 2: Convert to fraction form
   12,299.31/16,978.55 = 8,332.47/x
3. Step 3: Cross multiply
   12,299.31x = 16,978.55 × 8,332.47
4. Step 4: Simplify right side
   12,299.31x = 141,473,216.86
5. Step 5: Solve for x
   x = 141,473,216.86/12,299.31
6. Step 6: Final answer
   x = 11,502.53