Finding the Fourth Proportional to 78,465.68, 108,284.78 and 42,658.15

Step by Step Solution

1. Step 1: Write the proportion equation
   78,465.68 : 108,284.78 = 42,658.15 : x
2. Step 2: Convert to fraction form
   78,465.68/108,284.78 = 42,658.15/x
3. Step 3: Cross multiply
   78,465.68x = 108,284.78 × 42,658.15
4. Step 4: Simplify right side
   78,465.68x = 4,619,228,387.96
5. Step 5: Solve for x
   x = 4,619,228,387.96/78,465.68
6. Step 6: Final answer
   x = 58,869.41