Finding the Third Proportional to 13,609.13 and 20,413.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,609.13 : 20,413.69 = 20,413.69 : x
2. Step 2: Convert to fraction form
   13,609.13/20,413.69 = 20,413.69/x
3. Step 3: Cross multiply
   13,609.13x = 20,413.69 × 20,413.69
4. Step 4: Simplify right side
   13,609.13x = 416,718,637.35
5. Step 5: Solve for x
   x = 416,718,637.35/13,609.13
6. Step 6: Final answer
   x = 30,620.53