Finding the Fourth Proportional to 78,454.78, 108,265.31 and 42,643.87

Step by Step Solution

1. Step 1: Write the proportion equation
   78,454.78 : 108,265.31 = 42,643.87 : x
2. Step 2: Convert to fraction form
   78,454.78/108,265.31 = 42,643.87/x
3. Step 3: Cross multiply
   78,454.78x = 108,265.31 × 42,643.87
4. Step 4: Simplify right side
   78,454.78x = 4,616,851,481.18
5. Step 5: Solve for x
   x = 4,616,851,481.18/78,454.78
6. Step 6: Final answer
   x = 58,847.30