Finding the Third Proportional to 398.57 and 610.56

Step by Step Solution

1. Step 1: Write the proportion equation
   398.57 : 610.56 = 610.56 : x
2. Step 2: Convert to fraction form
   398.57/610.56 = 610.56/x
3. Step 3: Cross multiply
   398.57x = 610.56 × 610.56
4. Step 4: Simplify right side
   398.57x = 372,781.80
5. Step 5: Solve for x
   x = 372,781.80/398.57
6. Step 6: Final answer
   x = 935.31