Finding the Third Proportional to 336.09 and 723.72

Step by Step Solution

1. Step 1: Write the proportion equation
   336.09 : 723.72 = 723.72 : x
2. Step 2: Convert to fraction form
   336.09/723.72 = 723.72/x
3. Step 3: Cross multiply
   336.09x = 723.72 × 723.72
4. Step 4: Simplify right side
   336.09x = 523,768.83
5. Step 5: Solve for x
   x = 523,768.83/336.09
6. Step 6: Final answer
   x = 1,558.40