Finding the Third Proportional to 8,429.50 and 12,644

Step by Step Solution

1. Step 1: Write the proportion equation
   8,429.50 : 12,644 = 12,644 : x
2. Step 2: Convert to fraction form
   8,429.50/12,644 = 12,644/x
3. Step 3: Cross multiply
   8,429.50x = 12,644 × 12,644
4. Step 4: Simplify right side
   8,429.50x = 159,870,736
5. Step 5: Solve for x
   x = 159,870,736/8,429.50
6. Step 6: Final answer
   x = 18,965.63