Finding the Third Proportional to 356,747 and 489,191.50

Step by Step Solution

1. Step 1: Write the proportion equation
   356,747 : 489,191.50 = 489,191.50 : x
2. Step 2: Convert to fraction form
   356,747/489,191.50 = 489,191.50/x
3. Step 3: Cross multiply
   356,747x = 489,191.50 × 489,191.50
4. Step 4: Simplify right side
   356,747x = 239,308,323,672.25
5. Step 5: Solve for x
   x = 239,308,323,672.25/356,747
6. Step 6: Final answer
   x = 670,806.83