Finding the Third Proportional to 397.31 and 603.38

Step by Step Solution

1. Step 1: Write the proportion equation
   397.31 : 603.38 = 603.38 : x
2. Step 2: Convert to fraction form
   397.31/603.38 = 603.38/x
3. Step 3: Cross multiply
   397.31x = 603.38 × 603.38
4. Step 4: Simplify right side
   397.31x = 364,061.39
5. Step 5: Solve for x
   x = 364,061.39/397.31
6. Step 6: Final answer
   x = 916.31