Finding the Third Proportional to 12,978 and 18,495

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978 : 18,495 = 18,495 : x
2. Step 2: Convert to fraction form
   12,978/18,495 = 18,495/x
3. Step 3: Cross multiply
   12,978x = 18,495 × 18,495
4. Step 4: Simplify right side
   12,978x = 342,065,025
5. Step 5: Solve for x
   x = 342,065,025/12,978
6. Step 6: Final answer
   x = 26,357.30