Finding the Third Proportional to 298,819.50 and 647,418

Step by Step Solution

1. Step 1: Write the proportion equation
   298,819.50 : 647,418 = 647,418 : x
2. Step 2: Convert to fraction form
   298,819.50/647,418 = 647,418/x
3. Step 3: Cross multiply
   298,819.50x = 647,418 × 647,418
4. Step 4: Simplify right side
   298,819.50x = 419,150,066,724
5. Step 5: Solve for x
   x = 419,150,066,724/298,819.50
6. Step 6: Final answer
   x = 1,402,686.46