Finding the Fourth Proportional to 18,413.76, 25,402.89 and 12,443.25

Step by Step Solution

1. Step 1: Write the proportion equation
   18,413.76 : 25,402.89 = 12,443.25 : x
2. Step 2: Convert to fraction form
   18,413.76/25,402.89 = 12,443.25/x
3. Step 3: Cross multiply
   18,413.76x = 25,402.89 × 12,443.25
4. Step 4: Simplify right side
   18,413.76x = 316,094,510.99
5. Step 5: Solve for x
   x = 316,094,510.99/18,413.76
6. Step 6: Final answer
   x = 17,166.21