Finding the Third Proportional to 8,215.50 and 12,744.75

Step by Step Solution

1. Step 1: Write the proportion equation
   8,215.50 : 12,744.75 = 12,744.75 : x
2. Step 2: Convert to fraction form
   8,215.50/12,744.75 = 12,744.75/x
3. Step 3: Cross multiply
   8,215.50x = 12,744.75 × 12,744.75
4. Step 4: Simplify right side
   8,215.50x = 162,428,652.56
5. Step 5: Solve for x
   x = 162,428,652.56/8,215.50
6. Step 6: Final answer
   x = 19,771.00