Finding the Third Proportional to 321,493.50 and 700,128

Step by Step Solution

1. Step 1: Write the proportion equation
   321,493.50 : 700,128 = 700,128 : x
2. Step 2: Convert to fraction form
   321,493.50/700,128 = 700,128/x
3. Step 3: Cross multiply
   321,493.50x = 700,128 × 700,128
4. Step 4: Simplify right side
   321,493.50x = 490,179,216,384
5. Step 5: Solve for x
   x = 490,179,216,384/321,493.50
6. Step 6: Final answer
   x = 1,524,694.02