Finding the Third Proportional to 12,900 and 17,406

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900 : 17,406 = 17,406 : x
2. Step 2: Convert to fraction form
   12,900/17,406 = 17,406/x
3. Step 3: Cross multiply
   12,900x = 17,406 × 17,406
4. Step 4: Simplify right side
   12,900x = 302,968,836
5. Step 5: Solve for x
   x = 302,968,836/12,900
6. Step 6: Final answer
   x = 23,485.96