Finding the Third Proportional to 402.38 and 571.50

Step by Step Solution

1. Step 1: Write the proportion equation
   402.38 : 571.50 = 571.50 : x
2. Step 2: Convert to fraction form
   402.38/571.50 = 571.50/x
3. Step 3: Cross multiply
   402.38x = 571.50 × 571.50
4. Step 4: Simplify right side
   402.38x = 326,612.25
5. Step 5: Solve for x
   x = 326,612.25/402.38
6. Step 6: Final answer
   x = 811.71