Finding the Fourth Proportional to 20,737.72, 31,119.48 and 8,425.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,737.72 : 31,119.48 = 8,425.72 : x
2. Step 2: Convert to fraction form
   20,737.72/31,119.48 = 8,425.72/x
3. Step 3: Cross multiply
   20,737.72x = 31,119.48 × 8,425.72
4. Step 4: Simplify right side
   20,737.72x = 262,204,025.03
5. Step 5: Solve for x
   x = 262,204,025.03/20,737.72
6. Step 6: Final answer
   x = 12,643.82