Finding the Third Proportional to 5,115 and 10,685

Step by Step Solution

1. Step 1: Write the proportion equation
   5,115 : 10,685 = 10,685 : x
2. Step 2: Convert to fraction form
   5,115/10,685 = 10,685/x
3. Step 3: Cross multiply
   5,115x = 10,685 × 10,685
4. Step 4: Simplify right side
   5,115x = 114,169,225
5. Step 5: Solve for x
   x = 114,169,225/5,115
6. Step 6: Final answer
   x = 22,320.47