Finding the Third Proportional to 5,356.27 and 8,216.65

Step by Step Solution

1. Step 1: Write the proportion equation
   5,356.27 : 8,216.65 = 8,216.65 : x
2. Step 2: Convert to fraction form
   5,356.27/8,216.65 = 8,216.65/x
3. Step 3: Cross multiply
   5,356.27x = 8,216.65 × 8,216.65
4. Step 4: Simplify right side
   5,356.27x = 67,513,311.55
5. Step 5: Solve for x
   x = 67,513,311.55/5,356.27
6. Step 6: Final answer
   x = 12,604.55