Finding the Fourth Proportional to 21,665.52, 29,879.70 and 14,109

Step by Step Solution

1. Step 1: Write the proportion equation
   21,665.52 : 29,879.70 = 14,109 : x
2. Step 2: Convert to fraction form
   21,665.52/29,879.70 = 14,109/x
3. Step 3: Cross multiply
   21,665.52x = 29,879.70 × 14,109
4. Step 4: Simplify right side
   21,665.52x = 421,572,687.30
5. Step 5: Solve for x
   x = 421,572,687.30/21,665.52
6. Step 6: Final answer
   x = 19,458.23