Finding the Third Proportional to 298,432 and 647,424

Step by Step Solution

1. Step 1: Write the proportion equation
   298,432 : 647,424 = 647,424 : x
2. Step 2: Convert to fraction form
   298,432/647,424 = 647,424/x
3. Step 3: Cross multiply
   298,432x = 647,424 × 647,424
4. Step 4: Simplify right side
   298,432x = 419,157,835,776
5. Step 5: Solve for x
   x = 419,157,835,776/298,432
6. Step 6: Final answer
   x = 1,404,533.82