Finding the Third Proportional to 13,608 and 20,802.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,608 : 20,802.50 = 20,802.50 : x
2. Step 2: Convert to fraction form
   13,608/20,802.50 = 20,802.50/x
3. Step 3: Cross multiply
   13,608x = 20,802.50 × 20,802.50
4. Step 4: Simplify right side
   13,608x = 432,744,006.25
5. Step 5: Solve for x
   x = 432,744,006.25/13,608
6. Step 6: Final answer
   x = 31,800.71