Finding the Third Proportional to 528,665.50 and 851,229.50

Step by Step Solution

1. Step 1: Write the proportion equation
   528,665.50 : 851,229.50 = 851,229.50 : x
2. Step 2: Convert to fraction form
   528,665.50/851,229.50 = 851,229.50/x
3. Step 3: Cross multiply
   528,665.50x = 851,229.50 × 851,229.50
4. Step 4: Simplify right side
   528,665.50x = 724,591,661,670.25
5. Step 5: Solve for x
   x = 724,591,661,670.25/528,665.50
6. Step 6: Final answer
   x = 1,370,605.16