Finding the Third Proportional to 321,139.69 and 699,490.69

Step by Step Solution

1. Step 1: Write the proportion equation
   321,139.69 : 699,490.69 = 699,490.69 : x
2. Step 2: Convert to fraction form
   321,139.69/699,490.69 = 699,490.69/x
3. Step 3: Cross multiply
   321,139.69x = 699,490.69 × 699,490.69
4. Step 4: Simplify right side
   321,139.69x = 489,287,221,899.22
5. Step 5: Solve for x
   x = 489,287,221,899.22/321,139.69
6. Step 6: Final answer
   x = 1,523,596.24