Finding the Third Proportional to 288.56 and 406.27

Step by Step Solution

1. Step 1: Write the proportion equation
   288.56 : 406.27 = 406.27 : x
2. Step 2: Convert to fraction form
   288.56/406.27 = 406.27/x
3. Step 3: Cross multiply
   288.56x = 406.27 × 406.27
4. Step 4: Simplify right side
   288.56x = 165,051.76
5. Step 5: Solve for x
   x = 165,051.76/288.56
6. Step 6: Final answer
   x = 571.98