Finding the Third Proportional to 321,115.50 and 699,426

Step by Step Solution

1. Step 1: Write the proportion equation
   321,115.50 : 699,426 = 699,426 : x
2. Step 2: Convert to fraction form
   321,115.50/699,426 = 699,426/x
3. Step 3: Cross multiply
   321,115.50x = 699,426 × 699,426
4. Step 4: Simplify right side
   321,115.50x = 489,196,729,476
5. Step 5: Solve for x
   x = 489,196,729,476/321,115.50
6. Step 6: Final answer
   x = 1,523,429.20