Finding the Fourth Proportional to 12,609.92, 17,413.50 and 7,902.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,609.92 : 17,413.50 = 7,902.40 : x
2. Step 2: Convert to fraction form
   12,609.92/17,413.50 = 7,902.40/x
3. Step 3: Cross multiply
   12,609.92x = 17,413.50 × 7,902.40
4. Step 4: Simplify right side
   12,609.92x = 137,608,402.89
5. Step 5: Solve for x
   x = 137,608,402.89/12,609.92
6. Step 6: Final answer
   x = 10,912.71