Finding the Third Proportional to 489,454.50 and 689,274

Step by Step Solution

1. Step 1: Write the proportion equation
   489,454.50 : 689,274 = 689,274 : x
2. Step 2: Convert to fraction form
   489,454.50/689,274 = 689,274/x
3. Step 3: Cross multiply
   489,454.50x = 689,274 × 689,274
4. Step 4: Simplify right side
   489,454.50x = 475,098,647,076
5. Step 5: Solve for x
   x = 475,098,647,076/489,454.50
6. Step 6: Final answer
   x = 970,669.69