Finding the Third Proportional to 318.94 and 426.56

Step by Step Solution

1. Step 1: Write the proportion equation
   318.94 : 426.56 = 426.56 : x
2. Step 2: Convert to fraction form
   318.94/426.56 = 426.56/x
3. Step 3: Cross multiply
   318.94x = 426.56 × 426.56
4. Step 4: Simplify right side
   318.94x = 181,955.57
5. Step 5: Solve for x
   x = 181,955.57/318.94
6. Step 6: Final answer
   x = 570.51