Finding the Third Proportional to 8,311.50 and 18,111

Step by Step Solution

1. Step 1: Write the proportion equation
   8,311.50 : 18,111 = 18,111 : x
2. Step 2: Convert to fraction form
   8,311.50/18,111 = 18,111/x
3. Step 3: Cross multiply
   8,311.50x = 18,111 × 18,111
4. Step 4: Simplify right side
   8,311.50x = 328,008,321
5. Step 5: Solve for x
   x = 328,008,321/8,311.50
6. Step 6: Final answer
   x = 39,464.40