Finding the Fourth Proportional to 9,889.72, 13,647.82 and 5,413.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,889.72 : 13,647.82 = 5,413.47 : x
2. Step 2: Convert to fraction form
   9,889.72/13,647.82 = 5,413.47/x
3. Step 3: Cross multiply
   9,889.72x = 13,647.82 × 5,413.47
4. Step 4: Simplify right side
   9,889.72x = 73,882,064.14
5. Step 5: Solve for x
   x = 73,882,064.14/9,889.72
6. Step 6: Final answer
   x = 7,470.59