Finding the Third Proportional to 438.38 and 672.56

Step by Step Solution

1. Step 1: Write the proportion equation
   438.38 : 672.56 = 672.56 : x
2. Step 2: Convert to fraction form
   438.38/672.56 = 672.56/x
3. Step 3: Cross multiply
   438.38x = 672.56 × 672.56
4. Step 4: Simplify right side
   438.38x = 452,340.32
5. Step 5: Solve for x
   x = 452,340.32/438.38
6. Step 6: Final answer
   x = 1,031.86