Finding the Fourth Proportional to 14,490.48, 21,737.54 and 5,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   14,490.48 : 21,737.54 = 5,128.30 : x
2. Step 2: Convert to fraction form
   14,490.48/21,737.54 = 5,128.30/x
3. Step 3: Cross multiply
   14,490.48x = 21,737.54 × 5,128.30
4. Step 4: Simplify right side
   14,490.48x = 111,476,626.38
5. Step 5: Solve for x
   x = 111,476,626.38/14,490.48
6. Step 6: Final answer
   x = 7,693.09