Finding the Fourth Proportional to 21,903.87, 30,229.71 and 13,411.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,903.87 : 30,229.71 = 13,411.71 : x
2. Step 2: Convert to fraction form
   21,903.87/30,229.71 = 13,411.71/x
3. Step 3: Cross multiply
   21,903.87x = 30,229.71 × 13,411.71
4. Step 4: Simplify right side
   21,903.87x = 405,432,103.90
5. Step 5: Solve for x
   x = 405,432,103.90/21,903.87
6. Step 6: Final answer
   x = 18,509.61