Finding the Fourth Proportional to 12,290.39, 18,413.72 and 5,158.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,290.39 : 18,413.72 = 5,158.95 : x
2. Step 2: Convert to fraction form
   12,290.39/18,413.72 = 5,158.95/x
3. Step 3: Cross multiply
   12,290.39x = 18,413.72 × 5,158.95
4. Step 4: Simplify right side
   12,290.39x = 94,995,435.00
5. Step 5: Solve for x
   x = 94,995,435.00/12,290.39
6. Step 6: Final answer
   x = 7,729.24