Finding the Third Proportional to 354,919.50 and 774,067.50

Step by Step Solution

1. Step 1: Write the proportion equation
   354,919.50 : 774,067.50 = 774,067.50 : x
2. Step 2: Convert to fraction form
   354,919.50/774,067.50 = 774,067.50/x
3. Step 3: Cross multiply
   354,919.50x = 774,067.50 × 774,067.50
4. Step 4: Simplify right side
   354,919.50x = 599,180,494,556.25
5. Step 5: Solve for x
   x = 599,180,494,556.25/354,919.50
6. Step 6: Final answer
   x = 1,688,215.20