Finding the Third Proportional to 12,900 and 17,292

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900 : 17,292 = 17,292 : x
2. Step 2: Convert to fraction form
   12,900/17,292 = 17,292/x
3. Step 3: Cross multiply
   12,900x = 17,292 × 17,292
4. Step 4: Simplify right side
   12,900x = 299,013,264
5. Step 5: Solve for x
   x = 299,013,264/12,900
6. Step 6: Final answer
   x = 23,179.32