Finding the Third Proportional to 298,813.50 and 647,442

Step by Step Solution

1. Step 1: Write the proportion equation
   298,813.50 : 647,442 = 647,442 : x
2. Step 2: Convert to fraction form
   298,813.50/647,442 = 647,442/x
3. Step 3: Cross multiply
   298,813.50x = 647,442 × 647,442
4. Step 4: Simplify right side
   298,813.50x = 419,181,143,364
5. Step 5: Solve for x
   x = 419,181,143,364/298,813.50
6. Step 6: Final answer
   x = 1,402,818.63