Finding the Third Proportional to 12,644 and 18,216

Step by Step Solution

1. Step 1: Write the proportion equation
   12,644 : 18,216 = 18,216 : x
2. Step 2: Convert to fraction form
   12,644/18,216 = 18,216/x
3. Step 3: Cross multiply
   12,644x = 18,216 × 18,216
4. Step 4: Simplify right side
   12,644x = 331,822,656
5. Step 5: Solve for x
   x = 331,822,656/12,644
6. Step 6: Final answer
   x = 26,243.49