Finding the Fourth Proportional to 78,449.94, 108,256.32 and 42,639.64

Step by Step Solution

1. Step 1: Write the proportion equation
   78,449.94 : 108,256.32 = 42,639.64 : x
2. Step 2: Convert to fraction form
   78,449.94/108,256.32 = 42,639.64/x
3. Step 3: Cross multiply
   78,449.94x = 108,256.32 × 42,639.64
4. Step 4: Simplify right side
   78,449.94x = 4,616,010,666.28
5. Step 5: Solve for x
   x = 4,616,010,666.28/78,449.94
6. Step 6: Final answer
   x = 58,840.20