Finding the Fourth Proportional to 315,087.62, 472,629 and 78,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   315,087.62 : 472,629 = 78,428.72 : x
2. Step 2: Convert to fraction form
   315,087.62/472,629 = 78,428.72/x
3. Step 3: Cross multiply
   315,087.62x = 472,629 × 78,428.72
4. Step 4: Simplify right side
   315,087.62x = 37,067,687,504.88
5. Step 5: Solve for x
   x = 37,067,687,504.88/315,087.62
6. Step 6: Final answer
   x = 117,642.48