Finding the Third Proportional to 123,240 and 198,413.25

Step by Step Solution

1. Step 1: Write the proportion equation
   123,240 : 198,413.25 = 198,413.25 : x
2. Step 2: Convert to fraction form
   123,240/198,413.25 = 198,413.25/x
3. Step 3: Cross multiply
   123,240x = 198,413.25 × 198,413.25
4. Step 4: Simplify right side
   123,240x = 39,367,817,775.56
5. Step 5: Solve for x
   x = 39,367,817,775.56/123,240
6. Step 6: Final answer
   x = 319,440.26