Finding the Fourth Proportional to 48,078.72, 72,155.28 and 31,434.24

Step by Step Solution

1. Step 1: Write the proportion equation
   48,078.72 : 72,155.28 = 31,434.24 : x
2. Step 2: Convert to fraction form
   48,078.72/72,155.28 = 31,434.24/x
3. Step 3: Cross multiply
   48,078.72x = 72,155.28 × 31,434.24
4. Step 4: Simplify right side
   48,078.72x = 2,268,146,388.79
5. Step 5: Solve for x
   x = 2,268,146,388.79/48,078.72
6. Step 6: Final answer
   x = 47,175.68