Finding the Fourth Proportional to 56,648.85, 78,173.75 and 31,155.32

Step by Step Solution

1. Step 1: Write the proportion equation
   56,648.85 : 78,173.75 = 31,155.32 : x
2. Step 2: Convert to fraction form
   56,648.85/78,173.75 = 31,155.32/x
3. Step 3: Cross multiply
   56,648.85x = 78,173.75 × 31,155.32
4. Step 4: Simplify right side
   56,648.85x = 2,435,527,650.20
5. Step 5: Solve for x
   x = 2,435,527,650.20/56,648.85
6. Step 6: Final answer
   x = 42,993.42