Finding the Third Proportional to 321,285 and 697,877.50

Step by Step Solution

1. Step 1: Write the proportion equation
   321,285 : 697,877.50 = 697,877.50 : x
2. Step 2: Convert to fraction form
   321,285/697,877.50 = 697,877.50/x
3. Step 3: Cross multiply
   321,285x = 697,877.50 × 697,877.50
4. Step 4: Simplify right side
   321,285x = 487,033,005,006.25
5. Step 5: Solve for x
   x = 487,033,005,006.25/321,285
6. Step 6: Final answer
   x = 1,515,890.89