Finding the Third Proportional to 399.94 and 610.45

Step by Step Solution

1. Step 1: Write the proportion equation
   399.94 : 610.45 = 610.45 : x
2. Step 2: Convert to fraction form
   399.94/610.45 = 610.45/x
3. Step 3: Cross multiply
   399.94x = 610.45 × 610.45
4. Step 4: Simplify right side
   399.94x = 372,653.02
5. Step 5: Solve for x
   x = 372,653.02/399.94
6. Step 6: Final answer
   x = 931.78