Finding the Third Proportional to 311,806.50 and 671,650.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,806.50 : 671,650.50 = 671,650.50 : x
2. Step 2: Convert to fraction form
   311,806.50/671,650.50 = 671,650.50/x
3. Step 3: Cross multiply
   311,806.50x = 671,650.50 × 671,650.50
4. Step 4: Simplify right side
   311,806.50x = 451,114,394,150.25
5. Step 5: Solve for x
   x = 451,114,394,150.25/311,806.50
6. Step 6: Final answer
   x = 1,446,776.75