Finding the Third Proportional to 8,313 and 12,868.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,313 : 12,868.50 = 12,868.50 : x
2. Step 2: Convert to fraction form
   8,313/12,868.50 = 12,868.50/x
3. Step 3: Cross multiply
   8,313x = 12,868.50 × 12,868.50
4. Step 4: Simplify right side
   8,313x = 165,598,292.25
5. Step 5: Solve for x
   x = 165,598,292.25/8,313
6. Step 6: Final answer
   x = 19,920.40