Finding the Fourth Proportional to 14,490.72, 21,737.91 and 5,128.55

Step by Step Solution

1. Step 1: Write the proportion equation
   14,490.72 : 21,737.91 = 5,128.55 : x
2. Step 2: Convert to fraction form
   14,490.72/21,737.91 = 5,128.55/x
3. Step 3: Cross multiply
   14,490.72x = 21,737.91 × 5,128.55
4. Step 4: Simplify right side
   14,490.72x = 111,483,849.64
5. Step 5: Solve for x
   x = 111,483,849.64/14,490.72
6. Step 6: Final answer
   x = 7,693.47