Finding the Fourth Proportional to 42,442.72, 63,671.92 and 13,981.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,442.72 : 63,671.92 = 13,981.28 : x
2. Step 2: Convert to fraction form
   42,442.72/63,671.92 = 13,981.28/x
3. Step 3: Cross multiply
   42,442.72x = 63,671.92 × 13,981.28
4. Step 4: Simplify right side
   42,442.72x = 890,214,941.66
5. Step 5: Solve for x
   x = 890,214,941.66/42,442.72
6. Step 6: Final answer
   x = 20,974.50