Finding the Third Proportional to 404.72 and 647.86

Step by Step Solution

1. Step 1: Write the proportion equation
   404.72 : 647.86 = 647.86 : x
2. Step 2: Convert to fraction form
   404.72/647.86 = 647.86/x
3. Step 3: Cross multiply
   404.72x = 647.86 × 647.86
4. Step 4: Simplify right side
   404.72x = 419,721.77
5. Step 5: Solve for x
   x = 419,721.77/404.72
6. Step 6: Final answer
   x = 1,037.07