Finding the Third Proportional to 434.87 and 672.56

Step by Step Solution

1. Step 1: Write the proportion equation
   434.87 : 672.56 = 672.56 : x
2. Step 2: Convert to fraction form
   434.87/672.56 = 672.56/x
3. Step 3: Cross multiply
   434.87x = 672.56 × 672.56
4. Step 4: Simplify right side
   434.87x = 452,340.32
5. Step 5: Solve for x
   x = 452,340.32/434.87
6. Step 6: Final answer
   x = 1,040.17