Finding the Fourth Proportional to 78,318, 108,078.92 and 42,507.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78,318 : 108,078.92 = 42,507.98 : x
2. Step 2: Convert to fraction form
   78,318/108,078.92 = 42,507.98/x
3. Step 3: Cross multiply
   78,318x = 108,078.92 × 42,507.98
4. Step 4: Simplify right side
   78,318x = 4,594,216,569.78
5. Step 5: Solve for x
   x = 4,594,216,569.78/78,318
6. Step 6: Final answer
   x = 58,661.06