Finding the Fourth Proportional to 21,326.59, 29,442.72 and 14,789.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,326.59 : 29,442.72 = 14,789.89 : x
2. Step 2: Convert to fraction form
   21,326.59/29,442.72 = 14,789.89/x
3. Step 3: Cross multiply
   21,326.59x = 29,442.72 × 14,789.89
4. Step 4: Simplify right side
   21,326.59x = 435,454,590.10
5. Step 5: Solve for x
   x = 435,454,590.10/21,326.59
6. Step 6: Final answer
   x = 20,418.39