Finding the Fourth Proportional to 18,413.89, 25,409.98 and 10,858.49

Step by Step Solution

1. Step 1: Write the proportion equation
   18,413.89 : 25,409.98 = 10,858.49 : x
2. Step 2: Convert to fraction form
   18,413.89/25,409.98 = 10,858.49/x
3. Step 3: Cross multiply
   18,413.89x = 25,409.98 × 10,858.49
4. Step 4: Simplify right side
   18,413.89x = 275,914,072.20
5. Step 5: Solve for x
   x = 275,914,072.20/18,413.89
6. Step 6: Final answer
   x = 14,984.02