Finding the Fourth Proportional to 78,309.48, 108,067.89 and 42,499.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78,309.48 : 108,067.89 = 42,499.80 : x
2. Step 2: Convert to fraction form
   78,309.48/108,067.89 = 42,499.80/x
3. Step 3: Cross multiply
   78,309.48x = 108,067.89 × 42,499.80
4. Step 4: Simplify right side
   78,309.48x = 4,592,863,711.42
5. Step 5: Solve for x
   x = 4,592,863,711.42/78,309.48
6. Step 6: Final answer
   x = 58,650.16