Finding the Third Proportional to 487.27 and 805.57

Step by Step Solution

1. Step 1: Write the proportion equation
   487.27 : 805.57 = 805.57 : x
2. Step 2: Convert to fraction form
   487.27/805.57 = 805.57/x
3. Step 3: Cross multiply
   487.27x = 805.57 × 805.57
4. Step 4: Simplify right side
   487.27x = 648,943.53
5. Step 5: Solve for x
   x = 648,943.53/487.27
6. Step 6: Final answer
   x = 1,331.81