Finding the Fourth Proportional to 21,348.59, 31,943.59 and 13,413.95

Step by Step Solution

1. Step 1: Write the proportion equation
   21,348.59 : 31,943.59 = 13,413.95 : x
2. Step 2: Convert to fraction form
   21,348.59/31,943.59 = 13,413.95/x
3. Step 3: Cross multiply
   21,348.59x = 31,943.59 × 13,413.95
4. Step 4: Simplify right side
   21,348.59x = 428,489,863.03
5. Step 5: Solve for x
   x = 428,489,863.03/21,348.59
6. Step 6: Final answer
   x = 20,071.11