Finding the Third Proportional to 321,570 and 706,198.50

Step by Step Solution

1. Step 1: Write the proportion equation
   321,570 : 706,198.50 = 706,198.50 : x
2. Step 2: Convert to fraction form
   321,570/706,198.50 = 706,198.50/x
3. Step 3: Cross multiply
   321,570x = 706,198.50 × 706,198.50
4. Step 4: Simplify right side
   321,570x = 498,716,321,402.25
5. Step 5: Solve for x
   x = 498,716,321,402.25/321,570
6. Step 6: Final answer
   x = 1,550,879.50