Finding the Fourth Proportional to 9,413.25, 12,990.69 and 5,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.25 : 12,990.69 = 5,221.50 : x
2. Step 2: Convert to fraction form
   9,413.25/12,990.69 = 5,221.50/x
3. Step 3: Cross multiply
   9,413.25x = 12,990.69 × 5,221.50
4. Step 4: Simplify right side
   9,413.25x = 67,830,887.84
5. Step 5: Solve for x
   x = 67,830,887.84/9,413.25
6. Step 6: Final answer
   x = 7,205.89