Finding the Third Proportional to 311,574 and 677,821.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,574 : 677,821.50 = 677,821.50 : x
2. Step 2: Convert to fraction form
   311,574/677,821.50 = 677,821.50/x
3. Step 3: Cross multiply
   311,574x = 677,821.50 × 677,821.50
4. Step 4: Simplify right side
   311,574x = 459,441,985,862.25
5. Step 5: Solve for x
   x = 459,441,985,862.25/311,574
6. Step 6: Final answer
   x = 1,474,583.84