Finding the Third Proportional to 321,145.50 and 699,498

Step by Step Solution

1. Step 1: Write the proportion equation
   321,145.50 : 699,498 = 699,498 : x
2. Step 2: Convert to fraction form
   321,145.50/699,498 = 699,498/x
3. Step 3: Cross multiply
   321,145.50x = 699,498 × 699,498
4. Step 4: Simplify right side
   321,145.50x = 489,297,452,004
5. Step 5: Solve for x
   x = 489,297,452,004/321,145.50
6. Step 6: Final answer
   x = 1,523,600.52