Finding the Third Proportional to 320,323.50 and 699,673.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,323.50 : 699,673.50 = 699,673.50 : x
2. Step 2: Convert to fraction form
   320,323.50/699,673.50 = 699,673.50/x
3. Step 3: Cross multiply
   320,323.50x = 699,673.50 × 699,673.50
4. Step 4: Simplify right side
   320,323.50x = 489,543,006,602.25
5. Step 5: Solve for x
   x = 489,543,006,602.25/320,323.50
6. Step 6: Final answer
   x = 1,528,276.90