Finding the Third Proportional to 9,150 and 12,489

Step by Step Solution

1. Step 1: Write the proportion equation
   9,150 : 12,489 = 12,489 : x
2. Step 2: Convert to fraction form
   9,150/12,489 = 12,489/x
3. Step 3: Cross multiply
   9,150x = 12,489 × 12,489
4. Step 4: Simplify right side
   9,150x = 155,975,121
5. Step 5: Solve for x
   x = 155,975,121/9,150
6. Step 6: Final answer
   x = 17,046.46