Finding the Fourth Proportional to 9,413.52, 12,990.15 and 5,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.52 : 12,990.15 = 5,221.50 : x
2. Step 2: Convert to fraction form
   9,413.52/12,990.15 = 5,221.50/x
3. Step 3: Cross multiply
   9,413.52x = 12,990.15 × 5,221.50
4. Step 4: Simplify right side
   9,413.52x = 67,828,068.23
5. Step 5: Solve for x
   x = 67,828,068.23/9,413.52
6. Step 6: Final answer
   x = 7,205.39