Finding the Fourth Proportional to 9,413.74, 12,990.24 and 5,164.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.74 : 12,990.24 = 5,164.12 : x
2. Step 2: Convert to fraction form
   9,413.74/12,990.24 = 5,164.12/x
3. Step 3: Cross multiply
   9,413.74x = 12,990.24 × 5,164.12
4. Step 4: Simplify right side
   9,413.74x = 67,083,158.19
5. Step 5: Solve for x
   x = 67,083,158.19/9,413.74
6. Step 6: Final answer
   x = 7,126.09