Finding the Third Proportional to 8,215.50 and 17,817.75

Step by Step Solution

1. Step 1: Write the proportion equation
   8,215.50 : 17,817.75 = 17,817.75 : x
2. Step 2: Convert to fraction form
   8,215.50/17,817.75 = 17,817.75/x
3. Step 3: Cross multiply
   8,215.50x = 17,817.75 × 17,817.75
4. Step 4: Simplify right side
   8,215.50x = 317,472,215.06
5. Step 5: Solve for x
   x = 317,472,215.06/8,215.50
6. Step 6: Final answer
   x = 38,643.08