Finding the Third Proportional to 298,804.50 and 647,424

Step by Step Solution

1. Step 1: Write the proportion equation
   298,804.50 : 647,424 = 647,424 : x
2. Step 2: Convert to fraction form
   298,804.50/647,424 = 647,424/x
3. Step 3: Cross multiply
   298,804.50x = 647,424 × 647,424
4. Step 4: Simplify right side
   298,804.50x = 419,157,835,776
5. Step 5: Solve for x
   x = 419,157,835,776/298,804.50
6. Step 6: Final answer
   x = 1,402,782.88