Finding the Third Proportional to 8,142 and 12,496.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,142 : 12,496.50 = 12,496.50 : x
2. Step 2: Convert to fraction form
   8,142/12,496.50 = 12,496.50/x
3. Step 3: Cross multiply
   8,142x = 12,496.50 × 12,496.50
4. Step 4: Simplify right side
   8,142x = 156,162,512.25
5. Step 5: Solve for x
   x = 156,162,512.25/8,142
6. Step 6: Final answer
   x = 19,179.87