Finding the Fourth Proportional to 708.56, 1,062.72 and 323.72

Step by Step Solution

1. Step 1: Write the proportion equation
   708.56 : 1,062.72 = 323.72 : x
2. Step 2: Convert to fraction form
   708.56/1,062.72 = 323.72/x
3. Step 3: Cross multiply
   708.56x = 1,062.72 × 323.72
4. Step 4: Simplify right side
   708.56x = 344,023.72
5. Step 5: Solve for x
   x = 344,023.72/708.56
6. Step 6: Final answer
   x = 485.53