Finding the Fourth Proportional to 12,618.72, 17,413.20 and 7,028.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,618.72 : 17,413.20 = 7,028.64 : x
2. Step 2: Convert to fraction form
   12,618.72/17,413.20 = 7,028.64/x
3. Step 3: Cross multiply
   12,618.72x = 17,413.20 × 7,028.64
4. Step 4: Simplify right side
   12,618.72x = 122,391,114.05
5. Step 5: Solve for x
   x = 122,391,114.05/12,618.72
6. Step 6: Final answer
   x = 9,699.17