Finding the Fourth Proportional to 8,086.38, 12,131.55 and 2,820.66

Step by Step Solution

1. Step 1: Write the proportion equation
   8,086.38 : 12,131.55 = 2,820.66 : x
2. Step 2: Convert to fraction form
   8,086.38/12,131.55 = 2,820.66/x
3. Step 3: Cross multiply
   8,086.38x = 12,131.55 × 2,820.66
4. Step 4: Simplify right side
   8,086.38x = 34,218,977.82
5. Step 5: Solve for x
   x = 34,218,977.82/8,086.38
6. Step 6: Final answer
   x = 4,231.68