Finding the Fourth Proportional to 8,081.67, 12,121.57 and 2,815.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,081.67 : 12,121.57 = 2,815.78 : x
2. Step 2: Convert to fraction form
   8,081.67/12,121.57 = 2,815.78/x
3. Step 3: Cross multiply
   8,081.67x = 12,121.57 × 2,815.78
4. Step 4: Simplify right side
   8,081.67x = 34,131,674.37
5. Step 5: Solve for x
   x = 34,131,674.37/8,081.67
6. Step 6: Final answer
   x = 4,223.34