Finding the Third Proportional to 487.88 and 672.56

Step by Step Solution

1. Step 1: Write the proportion equation
   487.88 : 672.56 = 672.56 : x
2. Step 2: Convert to fraction form
   487.88/672.56 = 672.56/x
3. Step 3: Cross multiply
   487.88x = 672.56 × 672.56
4. Step 4: Simplify right side
   487.88x = 452,340.32
5. Step 5: Solve for x
   x = 452,340.32/487.88
6. Step 6: Final answer
   x = 927.16