Finding the Third Proportional to 8,240 and 12,745

Step by Step Solution

1. Step 1: Write the proportion equation
   8,240 : 12,745 = 12,745 : x
2. Step 2: Convert to fraction form
   8,240/12,745 = 12,745/x
3. Step 3: Cross multiply
   8,240x = 12,745 × 12,745
4. Step 4: Simplify right side
   8,240x = 162,435,025
5. Step 5: Solve for x
   x = 162,435,025/8,240
6. Step 6: Final answer
   x = 19,712.99