Finding the Third Proportional to 326,659 and 489,991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   326,659 : 489,991.50 = 489,991.50 : x
2. Step 2: Convert to fraction form
   326,659/489,991.50 = 489,991.50/x
3. Step 3: Cross multiply
   326,659x = 489,991.50 × 489,991.50
4. Step 4: Simplify right side
   326,659x = 240,091,670,072.25
5. Step 5: Solve for x
   x = 240,091,670,072.25/326,659
6. Step 6: Final answer
   x = 734,991.75