Finding the Third Proportional to 411.33 and 611.30

Step by Step Solution

1. Step 1: Write the proportion equation
   411.33 : 611.30 = 611.30 : x
2. Step 2: Convert to fraction form
   411.33/611.30 = 611.30/x
3. Step 3: Cross multiply
   411.33x = 611.30 × 611.30
4. Step 4: Simplify right side
   411.33x = 373,683.87
5. Step 5: Solve for x
   x = 373,683.87/411.33
6. Step 6: Final answer
   x = 908.48