Finding the Fourth Proportional to 11,857.06, 16,362.71 and 6,821.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,857.06 : 16,362.71 = 6,821.15 : x
2. Step 2: Convert to fraction form
   11,857.06/16,362.71 = 6,821.15/x
3. Step 3: Cross multiply
   11,857.06x = 16,362.71 × 6,821.15
4. Step 4: Simplify right side
   11,857.06x = 111,612,516.37
5. Step 5: Solve for x
   x = 111,612,516.37/11,857.06
6. Step 6: Final answer
   x = 9,413.17