Finding the Fourth Proportional to 139,413.49, 209,002.66 and 60,468.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,413.49 : 209,002.66 = 60,468.28 : x
2. Step 2: Convert to fraction form
   139,413.49/209,002.66 = 60,468.28/x
3. Step 3: Cross multiply
   139,413.49x = 209,002.66 × 60,468.28
4. Step 4: Simplify right side
   139,413.49x = 12,638,031,365.62
5. Step 5: Solve for x
   x = 12,638,031,365.62/139,413.49
6. Step 6: Final answer
   x = 90,651.42