Finding the Fourth Proportional to 21,329.05, 29,436.20 and 15,942.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,329.05 : 29,436.20 = 15,942.15 : x
2. Step 2: Convert to fraction form
   21,329.05/29,436.20 = 15,942.15/x
3. Step 3: Cross multiply
   21,329.05x = 29,436.20 × 15,942.15
4. Step 4: Simplify right side
   21,329.05x = 469,276,315.83
5. Step 5: Solve for x
   x = 469,276,315.83/21,329.05
6. Step 6: Final answer
   x = 22,001.74