Finding the Fourth Proportional to 21,915.27, 30,237.39 and 13,414.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,915.27 : 30,237.39 = 13,414.32 : x
2. Step 2: Convert to fraction form
   21,915.27/30,237.39 = 13,414.32/x
3. Step 3: Cross multiply
   21,915.27x = 30,237.39 × 13,414.32
4. Step 4: Simplify right side
   21,915.27x = 405,614,025.42
5. Step 5: Solve for x
   x = 405,614,025.42/21,915.27
6. Step 6: Final answer
   x = 18,508.28