Finding the Third Proportional to 12,915 and 16,900

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915 : 16,900 = 16,900 : x
2. Step 2: Convert to fraction form
   12,915/16,900 = 16,900/x
3. Step 3: Cross multiply
   12,915x = 16,900 × 16,900
4. Step 4: Simplify right side
   12,915x = 285,610,000
5. Step 5: Solve for x
   x = 285,610,000/12,915
6. Step 6: Final answer
   x = 22,114.60