Finding the Fourth Proportional to 78,470.20, 108,288.64 and 42,659.96

Step by Step Solution

1. Step 1: Write the proportion equation
   78,470.20 : 108,288.64 = 42,659.96 : x
2. Step 2: Convert to fraction form
   78,470.20/108,288.64 = 42,659.96/x
3. Step 3: Cross multiply
   78,470.20x = 108,288.64 × 42,659.96
4. Step 4: Simplify right side
   78,470.20x = 4,619,589,050.85
5. Step 5: Solve for x
   x = 4,619,589,050.85/78,470.20
6. Step 6: Final answer
   x = 58,870.62