Finding the Fourth Proportional to 22,816.72, 34,237.88 and 12,429.20

Step by Step Solution

1. Step 1: Write the proportion equation
   22,816.72 : 34,237.88 = 12,429.20 : x
2. Step 2: Convert to fraction form
   22,816.72/34,237.88 = 12,429.20/x
3. Step 3: Cross multiply
   22,816.72x = 34,237.88 × 12,429.20
4. Step 4: Simplify right side
   22,816.72x = 425,549,458.10
5. Step 5: Solve for x
   x = 425,549,458.10/22,816.72
6. Step 6: Final answer
   x = 18,650.77