Finding the Fourth Proportional to 9,413.46, 12,990.70 and 5,878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,413.46 : 12,990.70 = 5,878.72 : x
2. Step 2: Convert to fraction form
   9,413.46/12,990.70 = 5,878.72/x
3. Step 3: Cross multiply
   9,413.46x = 12,990.70 × 5,878.72
4. Step 4: Simplify right side
   9,413.46x = 76,368,687.90
5. Step 5: Solve for x
   x = 76,368,687.90/9,413.46
6. Step 6: Final answer
   x = 8,112.71