Finding the Fourth Proportional to 78,639.18, 108,523.36 and 42,829.89

Step by Step Solution

1. Step 1: Write the proportion equation
   78,639.18 : 108,523.36 = 42,829.89 : x
2. Step 2: Convert to fraction form
   78,639.18/108,523.36 = 42,829.89/x
3. Step 3: Cross multiply
   78,639.18x = 108,523.36 × 42,829.89
4. Step 4: Simplify right side
   78,639.18x = 4,648,043,571.23
5. Step 5: Solve for x
   x = 4,648,043,571.23/78,639.18
6. Step 6: Final answer
   x = 59,105.95