Finding the Third Proportional to 321,153.75 and 705,856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   321,153.75 : 705,856.50 = 705,856.50 : x
2. Step 2: Convert to fraction form
   321,153.75/705,856.50 = 705,856.50/x
3. Step 3: Cross multiply
   321,153.75x = 705,856.50 × 705,856.50
4. Step 4: Simplify right side
   321,153.75x = 498,233,398,592.25
5. Step 5: Solve for x
   x = 498,233,398,592.25/321,153.75
6. Step 6: Final answer
   x = 1,551,385.90