Finding the Fourth Proportional to 21,435.72, 29,550.24 and 14,710.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,435.72 : 29,550.24 = 14,710.80 : x
2. Step 2: Convert to fraction form
   21,435.72/29,550.24 = 14,710.80/x
3. Step 3: Cross multiply
   21,435.72x = 29,550.24 × 14,710.80
4. Step 4: Simplify right side
   21,435.72x = 434,707,670.59
5. Step 5: Solve for x
   x = 434,707,670.59/21,435.72
6. Step 6: Final answer
   x = 20,279.59