Finding the Third Proportional to 8,120 and 12,892

Step by Step Solution

1. Step 1: Write the proportion equation
   8,120 : 12,892 = 12,892 : x
2. Step 2: Convert to fraction form
   8,120/12,892 = 12,892/x
3. Step 3: Cross multiply
   8,120x = 12,892 × 12,892
4. Step 4: Simplify right side
   8,120x = 166,203,664
5. Step 5: Solve for x
   x = 166,203,664/8,120
6. Step 6: Final answer
   x = 20,468.43