Finding the Third Proportional to 321,578 and 700,300

Step by Step Solution

1. Step 1: Write the proportion equation
   321,578 : 700,300 = 700,300 : x
2. Step 2: Convert to fraction form
   321,578/700,300 = 700,300/x
3. Step 3: Cross multiply
   321,578x = 700,300 × 700,300
4. Step 4: Simplify right side
   321,578x = 490,420,090,000
5. Step 5: Solve for x
   x = 490,420,090,000/321,578
6. Step 6: Final answer
   x = 1,525,042.42