Finding the Fourth Proportional to 78,317.76, 108,078.61 and 42,507.78

Step by Step Solution

1. Step 1: Write the proportion equation
   78,317.76 : 108,078.61 = 42,507.78 : x
2. Step 2: Convert to fraction form
   78,317.76/108,078.61 = 42,507.78/x
3. Step 3: Cross multiply
   78,317.76x = 108,078.61 × 42,507.78
4. Step 4: Simplify right side
   78,317.76x = 4,594,181,776.59
5. Step 5: Solve for x
   x = 4,594,181,776.59/78,317.76
6. Step 6: Final answer
   x = 58,660.79