Finding the Fourth Proportional to 12,647.52, 17,413.92 and 10,402.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,647.52 : 17,413.92 = 10,402.20 : x
2. Step 2: Convert to fraction form
   12,647.52/17,413.92 = 10,402.20/x
3. Step 3: Cross multiply
   12,647.52x = 17,413.92 × 10,402.20
4. Step 4: Simplify right side
   12,647.52x = 181,143,078.62
5. Step 5: Solve for x
   x = 181,143,078.62/12,647.52
6. Step 6: Final answer
   x = 14,322.42