Finding the Third Proportional to 8,216.81 and 12,311.06

Step by Step Solution

1. Step 1: Write the proportion equation
   8,216.81 : 12,311.06 = 12,311.06 : x
2. Step 2: Convert to fraction form
   8,216.81/12,311.06 = 12,311.06/x
3. Step 3: Cross multiply
   8,216.81x = 12,311.06 × 12,311.06
4. Step 4: Simplify right side
   8,216.81x = 151,562,259.88
5. Step 5: Solve for x
   x = 151,562,259.88/8,216.81
6. Step 6: Final answer
   x = 18,445.38