Finding the Fourth Proportional to 78,449.27, 108,260.84 and 42,639.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,449.27 : 108,260.84 = 42,639.30 : x
2. Step 2: Convert to fraction form
   78,449.27/108,260.84 = 42,639.30/x
3. Step 3: Cross multiply
   78,449.27x = 108,260.84 × 42,639.30
4. Step 4: Simplify right side
   78,449.27x = 4,616,166,541.61
5. Step 5: Solve for x
   x = 4,616,166,541.61/78,449.27
6. Step 6: Final answer
   x = 58,842.69