Finding the Third Proportional to 6,216 and 12,868.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,216 : 12,868.50 = 12,868.50 : x
2. Step 2: Convert to fraction form
   6,216/12,868.50 = 12,868.50/x
3. Step 3: Cross multiply
   6,216x = 12,868.50 × 12,868.50
4. Step 4: Simplify right side
   6,216x = 165,598,292.25
5. Step 5: Solve for x
   x = 165,598,292.25/6,216
6. Step 6: Final answer
   x = 26,640.65