Finding the Third Proportional to 356,816 and 489,274.50

Step by Step Solution

1. Step 1: Write the proportion equation
   356,816 : 489,274.50 = 489,274.50 : x
2. Step 2: Convert to fraction form
   356,816/489,274.50 = 489,274.50/x
3. Step 3: Cross multiply
   356,816x = 489,274.50 × 489,274.50
4. Step 4: Simplify right side
   356,816x = 239,389,536,350.25
5. Step 5: Solve for x
   x = 239,389,536,350.25/356,816
6. Step 6: Final answer
   x = 670,904.71