Finding the Fourth Proportional to 11,329.43, 16,978.61 and 8,553.83

Step by Step Solution

1. Step 1: Write the proportion equation
   11,329.43 : 16,978.61 = 8,553.83 : x
2. Step 2: Convert to fraction form
   11,329.43/16,978.61 = 8,553.83/x
3. Step 3: Cross multiply
   11,329.43x = 16,978.61 × 8,553.83
4. Step 4: Simplify right side
   11,329.43x = 145,232,015.91
5. Step 5: Solve for x
   x = 145,232,015.91/11,329.43
6. Step 6: Final answer
   x = 12,819.01