Finding the Third Proportional to 12,911 and 17,423

Step by Step Solution

1. Step 1: Write the proportion equation
   12,911 : 17,423 = 17,423 : x
2. Step 2: Convert to fraction form
   12,911/17,423 = 17,423/x
3. Step 3: Cross multiply
   12,911x = 17,423 × 17,423
4. Step 4: Simplify right side
   12,911x = 303,560,929
5. Step 5: Solve for x
   x = 303,560,929/12,911
6. Step 6: Final answer
   x = 23,511.81