Finding the Fourth Proportional to 12,109.24, 18,152.90 and 8,413.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.24 : 18,152.90 = 8,413.20 : x
2. Step 2: Convert to fraction form
   12,109.24/18,152.90 = 8,413.20/x
3. Step 3: Cross multiply
   12,109.24x = 18,152.90 × 8,413.20
4. Step 4: Simplify right side
   12,109.24x = 152,723,978.28
5. Step 5: Solve for x
   x = 152,723,978.28/12,109.24
6. Step 6: Final answer
   x = 12,612.19