Finding the Third Proportional to 292.31 and 645.38

Step by Step Solution

1. Step 1: Write the proportion equation
   292.31 : 645.38 = 645.38 : x
2. Step 2: Convert to fraction form
   292.31/645.38 = 645.38/x
3. Step 3: Cross multiply
   292.31x = 645.38 × 645.38
4. Step 4: Simplify right side
   292.31x = 416,508.89
5. Step 5: Solve for x
   x = 416,508.89/292.31
6. Step 6: Final answer
   x = 1,424.88