Finding the Third Proportional to 356,725.50 and 489,158

Step by Step Solution

1. Step 1: Write the proportion equation
   356,725.50 : 489,158 = 489,158 : x
2. Step 2: Convert to fraction form
   356,725.50/489,158 = 489,158/x
3. Step 3: Cross multiply
   356,725.50x = 489,158 × 489,158
4. Step 4: Simplify right side
   356,725.50x = 239,275,548,964
5. Step 5: Solve for x
   x = 239,275,548,964/356,725.50
6. Step 6: Final answer
   x = 670,755.38