Finding the Fourth Proportional to 13,078.78, 18,047.28 and 7,413.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,078.78 : 18,047.28 = 7,413.10 : x
2. Step 2: Convert to fraction form
   13,078.78/18,047.28 = 7,413.10/x
3. Step 3: Cross multiply
   13,078.78x = 18,047.28 × 7,413.10
4. Step 4: Simplify right side
   13,078.78x = 133,786,291.37
5. Step 5: Solve for x
   x = 133,786,291.37/13,078.78
6. Step 6: Final answer
   x = 10,229.26