Finding the Third Proportional to 489,452.50 and 689,271

Step by Step Solution

1. Step 1: Write the proportion equation
   489,452.50 : 689,271 = 689,271 : x
2. Step 2: Convert to fraction form
   489,452.50/689,271 = 689,271/x
3. Step 3: Cross multiply
   489,452.50x = 689,271 × 689,271
4. Step 4: Simplify right side
   489,452.50x = 475,094,511,441
5. Step 5: Solve for x
   x = 475,094,511,441/489,452.50
6. Step 6: Final answer
   x = 970,665.21