Finding the Fourth Proportional to 22,790.72, 31,452 and 13,358.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,790.72 : 31,452 = 13,358.72 : x
2. Step 2: Convert to fraction form
   22,790.72/31,452 = 13,358.72/x
3. Step 3: Cross multiply
   22,790.72x = 31,452 × 13,358.72
4. Step 4: Simplify right side
   22,790.72x = 420,158,461.44
5. Step 5: Solve for x
   x = 420,158,461.44/22,790.72
6. Step 6: Final answer
   x = 18,435.51