Finding the Fourth Proportional to 78,738.84, 108,658.55 and 42,928.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78,738.84 : 108,658.55 = 42,928.79 : x
2. Step 2: Convert to fraction form
   78,738.84/108,658.55 = 42,928.79/x
3. Step 3: Cross multiply
   78,738.84x = 108,658.55 × 42,928.79
4. Step 4: Simplify right side
   78,738.84x = 4,664,579,638.68
5. Step 5: Solve for x
   x = 4,664,579,638.68/78,738.84
6. Step 6: Final answer
   x = 59,241.15