Finding the Fourth Proportional to 8,072.15, 12,072.82 and 7,188.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,072.15 : 12,072.82 = 7,188.91 : x
2. Step 2: Convert to fraction form
   8,072.15/12,072.82 = 7,188.91/x
3. Step 3: Cross multiply
   8,072.15x = 12,072.82 × 7,188.91
4. Step 4: Simplify right side
   8,072.15x = 86,790,413.54
5. Step 5: Solve for x
   x = 86,790,413.54/8,072.15
6. Step 6: Final answer
   x = 10,751.83