Finding the Fourth Proportional to 78,449.30, 108,260.70 and 42,639.32

Step by Step Solution

1. Step 1: Write the proportion equation
   78,449.30 : 108,260.70 = 42,639.32 : x
2. Step 2: Convert to fraction form
   78,449.30/108,260.70 = 42,639.32/x
3. Step 3: Cross multiply
   78,449.30x = 108,260.70 × 42,639.32
4. Step 4: Simplify right side
   78,449.30x = 4,616,162,630.72
5. Step 5: Solve for x
   x = 4,616,162,630.72/78,449.30
6. Step 6: Final answer
   x = 58,842.62