Finding the Third Proportional to 8,687 and 13,460

Step by Step Solution

1. Step 1: Write the proportion equation
   8,687 : 13,460 = 13,460 : x
2. Step 2: Convert to fraction form
   8,687/13,460 = 13,460/x
3. Step 3: Cross multiply
   8,687x = 13,460 × 13,460
4. Step 4: Simplify right side
   8,687x = 181,171,600
5. Step 5: Solve for x
   x = 181,171,600/8,687
6. Step 6: Final answer
   x = 20,855.49