Finding the Third Proportional to 321,592.50 and 678,863.25

Step by Step Solution

1. Step 1: Write the proportion equation
   321,592.50 : 678,863.25 = 678,863.25 : x
2. Step 2: Convert to fraction form
   321,592.50/678,863.25 = 678,863.25/x
3. Step 3: Cross multiply
   321,592.50x = 678,863.25 × 678,863.25
4. Step 4: Simplify right side
   321,592.50x = 460,855,312,200.56
5. Step 5: Solve for x
   x = 460,855,312,200.56/321,592.50
6. Step 6: Final answer
   x = 1,433,041.23