Finding the Fourth Proportional to 72,458.55, 108,637.20 and 42,861.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72,458.55 : 108,637.20 = 42,861.15 : x
2. Step 2: Convert to fraction form
   72,458.55/108,637.20 = 42,861.15/x
3. Step 3: Cross multiply
   72,458.55x = 108,637.20 × 42,861.15
4. Step 4: Simplify right side
   72,458.55x = 4,656,315,324.78
5. Step 5: Solve for x
   x = 4,656,315,324.78/72,458.55
6. Step 6: Final answer
   x = 64,261.78