Finding the Third Proportional to 320,953.50 and 677,710.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,953.50 : 677,710.50 = 677,710.50 : x
2. Step 2: Convert to fraction form
   320,953.50/677,710.50 = 677,710.50/x
3. Step 3: Cross multiply
   320,953.50x = 677,710.50 × 677,710.50
4. Step 4: Simplify right side
   320,953.50x = 459,291,521,810.25
5. Step 5: Solve for x
   x = 459,291,521,810.25/320,953.50
6. Step 6: Final answer
   x = 1,431,022.01