Finding the Third Proportional to 12,699 and 20,398.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,699 : 20,398.50 = 20,398.50 : x
2. Step 2: Convert to fraction form
   12,699/20,398.50 = 20,398.50/x
3. Step 3: Cross multiply
   12,699x = 20,398.50 × 20,398.50
4. Step 4: Simplify right side
   12,699x = 416,098,802.25
5. Step 5: Solve for x
   x = 416,098,802.25/12,699
6. Step 6: Final answer
   x = 32,766.27