Finding the Third Proportional to 8,706.63 and 12,687.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,706.63 : 12,687.38 = 12,687.38 : x
2. Step 2: Convert to fraction form
   8,706.63/12,687.38 = 12,687.38/x
3. Step 3: Cross multiply
   8,706.63x = 12,687.38 × 12,687.38
4. Step 4: Simplify right side
   8,706.63x = 160,969,484.39
5. Step 5: Solve for x
   x = 160,969,484.39/8,706.63
6. Step 6: Final answer
   x = 18,488.16