Finding the Fourth Proportional to 78,468.18, 108,288.21 and 42,660.65

Step by Step Solution

1. Step 1: Write the proportion equation
   78,468.18 : 108,288.21 = 42,660.65 : x
2. Step 2: Convert to fraction form
   78,468.18/108,288.21 = 42,660.65/x
3. Step 3: Cross multiply
   78,468.18x = 108,288.21 × 42,660.65
4. Step 4: Simplify right side
   78,468.18x = 4,619,644,884.50
5. Step 5: Solve for x
   x = 4,619,644,884.50/78,468.18
6. Step 6: Final answer
   x = 58,872.84