Finding the Third Proportional to 8,105 and 12,215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,105 : 12,215.50 = 12,215.50 : x
2. Step 2: Convert to fraction form
   8,105/12,215.50 = 12,215.50/x
3. Step 3: Cross multiply
   8,105x = 12,215.50 × 12,215.50
4. Step 4: Simplify right side
   8,105x = 149,218,440.25
5. Step 5: Solve for x
   x = 149,218,440.25/8,105
6. Step 6: Final answer
   x = 18,410.67