Finding the Third Proportional to 298,815.75 and 647,410.50

Step by Step Solution

1. Step 1: Write the proportion equation
   298,815.75 : 647,410.50 = 647,410.50 : x
2. Step 2: Convert to fraction form
   298,815.75/647,410.50 = 647,410.50/x
3. Step 3: Cross multiply
   298,815.75x = 647,410.50 × 647,410.50
4. Step 4: Simplify right side
   298,815.75x = 419,140,355,510.25
5. Step 5: Solve for x
   x = 419,140,355,510.25/298,815.75
6. Step 6: Final answer
   x = 1,402,671.56