Finding the Third Proportional to 321,498 and 700,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   321,498 : 700,139.25 = 700,139.25 : x
2. Step 2: Convert to fraction form
   321,498/700,139.25 = 700,139.25/x
3. Step 3: Cross multiply
   321,498x = 700,139.25 × 700,139.25
4. Step 4: Simplify right side
   321,498x = 490,194,969,390.56
5. Step 5: Solve for x
   x = 490,194,969,390.56/321,498
6. Step 6: Final answer
   x = 1,524,721.68