Finding the Third Proportional to 298,804 and 647,392

Step by Step Solution

1. Step 1: Write the proportion equation
   298,804 : 647,392 = 647,392 : x
2. Step 2: Convert to fraction form
   298,804/647,392 = 647,392/x
3. Step 3: Cross multiply
   298,804x = 647,392 × 647,392
4. Step 4: Simplify right side
   298,804x = 419,116,401,664
5. Step 5: Solve for x
   x = 419,116,401,664/298,804
6. Step 6: Final answer
   x = 1,402,646.56