Finding the Fourth Proportional to 3,923.82, 5,414.72 and 2,131.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,923.82 : 5,414.72 = 2,131.22 : x
2. Step 2: Convert to fraction form
   3,923.82/5,414.72 = 2,131.22/x
3. Step 3: Cross multiply
   3,923.82x = 5,414.72 × 2,131.22
4. Step 4: Simplify right side
   3,923.82x = 11,539,921.83
5. Step 5: Solve for x
   x = 11,539,921.83/3,923.82
6. Step 6: Final answer
   x = 2,940.99