Finding the Fourth Proportional to 16,490.16, 24,736.86 and 7,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,490.16 : 24,736.86 = 7,128.72 : x
2. Step 2: Convert to fraction form
   16,490.16/24,736.86 = 7,128.72/x
3. Step 3: Cross multiply
   16,490.16x = 24,736.86 × 7,128.72
4. Step 4: Simplify right side
   16,490.16x = 176,342,148.62
5. Step 5: Solve for x
   x = 176,342,148.62/16,490.16
6. Step 6: Final answer
   x = 10,693.78