Finding the Fourth Proportional to 315,086.62, 472,627.50 and 78,427.72

Step by Step Solution

1. Step 1: Write the proportion equation
   315,086.62 : 472,627.50 = 78,427.72 : x
2. Step 2: Convert to fraction form
   315,086.62/472,627.50 = 78,427.72/x
3. Step 3: Cross multiply
   315,086.62x = 472,627.50 × 78,427.72
4. Step 4: Simplify right side
   315,086.62x = 37,067,097,234.30
5. Step 5: Solve for x
   x = 37,067,097,234.30/315,086.62
6. Step 6: Final answer
   x = 117,640.98