Finding the Third Proportional to 15,684 and 17,156

Step by Step Solution

1. Step 1: Write the proportion equation
   15,684 : 17,156 = 17,156 : x
2. Step 2: Convert to fraction form
   15,684/17,156 = 17,156/x
3. Step 3: Cross multiply
   15,684x = 17,156 × 17,156
4. Step 4: Simplify right side
   15,684x = 294,328,336
5. Step 5: Solve for x
   x = 294,328,336/15,684
6. Step 6: Final answer
   x = 18,766.15