Finding the Third Proportional to 9,997.17 and 12,915.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,997.17 : 12,915.07 = 12,915.07 : x
2. Step 2: Convert to fraction form
   9,997.17/12,915.07 = 12,915.07/x
3. Step 3: Cross multiply
   9,997.17x = 12,915.07 × 12,915.07
4. Step 4: Simplify right side
   9,997.17x = 166,799,041.18
5. Step 5: Solve for x
   x = 166,799,041.18/9,997.17
6. Step 6: Final answer
   x = 16,684.62