Finding the Third Proportional to 298,802.25 and 647,388

Step by Step Solution

1. Step 1: Write the proportion equation
   298,802.25 : 647,388 = 647,388 : x
2. Step 2: Convert to fraction form
   298,802.25/647,388 = 647,388/x
3. Step 3: Cross multiply
   298,802.25x = 647,388 × 647,388
4. Step 4: Simplify right side
   298,802.25x = 419,111,222,544
5. Step 5: Solve for x
   x = 419,111,222,544/298,802.25
6. Step 6: Final answer
   x = 1,402,637.44