Finding the Fourth Proportional to 78,470.80, 108,290.39 and 42,660.83

Step by Step Solution

1. Step 1: Write the proportion equation
   78,470.80 : 108,290.39 = 42,660.83 : x
2. Step 2: Convert to fraction form
   78,470.80/108,290.39 = 42,660.83/x
3. Step 3: Cross multiply
   78,470.80x = 108,290.39 × 42,660.83
4. Step 4: Simplify right side
   78,470.80x = 4,619,757,975.85
5. Step 5: Solve for x
   x = 4,619,757,975.85/78,470.80
6. Step 6: Final answer
   x = 58,872.32