Finding the Fourth Proportional to 13,615.38, 18,789.30 and 7,647.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,615.38 : 18,789.30 = 7,647.30 : x
2. Step 2: Convert to fraction form
   13,615.38/18,789.30 = 7,647.30/x
3. Step 3: Cross multiply
   13,615.38x = 18,789.30 × 7,647.30
4. Step 4: Simplify right side
   13,615.38x = 143,687,413.89
5. Step 5: Solve for x
   x = 143,687,413.89/13,615.38
6. Step 6: Final answer
   x = 10,553.32