Finding the Third Proportional to 550,611 and 851,020.50

Step by Step Solution

1. Step 1: Write the proportion equation
   550,611 : 851,020.50 = 851,020.50 : x
2. Step 2: Convert to fraction form
   550,611/851,020.50 = 851,020.50/x
3. Step 3: Cross multiply
   550,611x = 851,020.50 × 851,020.50
4. Step 4: Simplify right side
   550,611x = 724,235,891,420.25
5. Step 5: Solve for x
   x = 724,235,891,420.25/550,611
6. Step 6: Final answer
   x = 1,315,331.32