Finding the Fourth Proportional to 13,078.45, 18,047.87 and 7,413.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,078.45 : 18,047.87 = 7,413.72 : x
2. Step 2: Convert to fraction form
   13,078.45/18,047.87 = 7,413.72/x
3. Step 3: Cross multiply
   13,078.45x = 18,047.87 × 7,413.72
4. Step 4: Simplify right side
   13,078.45x = 133,801,854.78
5. Step 5: Solve for x
   x = 133,801,854.78/13,078.45
6. Step 6: Final answer
   x = 10,230.71