Finding the Fourth Proportional to 78,738.80, 108,659.46 and 42,928.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78,738.80 : 108,659.46 = 42,928.80 : x
2. Step 2: Convert to fraction form
   78,738.80/108,659.46 = 42,928.80/x
3. Step 3: Cross multiply
   78,738.80x = 108,659.46 × 42,928.80
4. Step 4: Simplify right side
   78,738.80x = 4,664,620,226.45
5. Step 5: Solve for x
   x = 4,664,620,226.45/78,738.80
6. Step 6: Final answer
   x = 59,241.70