Finding the Third Proportional to 8,543 and 12,499

Step by Step Solution

1. Step 1: Write the proportion equation
   8,543 : 12,499 = 12,499 : x
2. Step 2: Convert to fraction form
   8,543/12,499 = 12,499/x
3. Step 3: Cross multiply
   8,543x = 12,499 × 12,499
4. Step 4: Simplify right side
   8,543x = 156,225,001
5. Step 5: Solve for x
   x = 156,225,001/8,543
6. Step 6: Final answer
   x = 18,286.90