Finding the Third Proportional to 287.63 and 603.38

Step by Step Solution

1. Step 1: Write the proportion equation
   287.63 : 603.38 = 603.38 : x
2. Step 2: Convert to fraction form
   287.63/603.38 = 603.38/x
3. Step 3: Cross multiply
   287.63x = 603.38 × 603.38
4. Step 4: Simplify right side
   287.63x = 364,061.39
5. Step 5: Solve for x
   x = 364,061.39/287.63
6. Step 6: Final answer
   x = 1,265.75