Finding the Third Proportional to 425,738 and 640,384

Step by Step Solution

1. Step 1: Write the proportion equation
   425,738 : 640,384 = 640,384 : x
2. Step 2: Convert to fraction form
   425,738/640,384 = 640,384/x
3. Step 3: Cross multiply
   425,738x = 640,384 × 640,384
4. Step 4: Simplify right side
   425,738x = 410,091,667,456
5. Step 5: Solve for x
   x = 410,091,667,456/425,738
6. Step 6: Final answer
   x = 963,248.92