Finding the Third Proportional to 12,900 and 17,405

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900 : 17,405 = 17,405 : x
2. Step 2: Convert to fraction form
   12,900/17,405 = 17,405/x
3. Step 3: Cross multiply
   12,900x = 17,405 × 17,405
4. Step 4: Simplify right side
   12,900x = 302,934,025
5. Step 5: Solve for x
   x = 302,934,025/12,900
6. Step 6: Final answer
   x = 23,483.26