Finding the Fourth Proportional to 9,413.01, 12,988.53 and 5,379.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.01 : 12,988.53 = 5,379.15 : x
2. Step 2: Convert to fraction form
   9,413.01/12,988.53 = 5,379.15/x
3. Step 3: Cross multiply
   9,413.01x = 12,988.53 × 5,379.15
4. Step 4: Simplify right side
   9,413.01x = 69,867,251.15
5. Step 5: Solve for x
   x = 69,867,251.15/9,413.01
6. Step 6: Final answer
   x = 7,422.41