Finding the Fourth Proportional to 9,413.69, 12,990.82 and 5,164.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.69 : 12,990.82 = 5,164.79 : x
2. Step 2: Convert to fraction form
   9,413.69/12,990.82 = 5,164.79/x
3. Step 3: Cross multiply
   9,413.69x = 12,990.82 × 5,164.79
4. Step 4: Simplify right side
   9,413.69x = 67,094,857.23
5. Step 5: Solve for x
   x = 67,094,857.23/9,413.69
6. Step 6: Final answer
   x = 7,127.37