Finding the Fourth Proportional to 3,911.42, 5,397.83 and 2,142.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,911.42 : 5,397.83 = 2,142.91 : x
2. Step 2: Convert to fraction form
   3,911.42/5,397.83 = 2,142.91/x
3. Step 3: Cross multiply
   3,911.42x = 5,397.83 × 2,142.91
4. Step 4: Simplify right side
   3,911.42x = 11,567,067.95
5. Step 5: Solve for x
   x = 11,567,067.95/3,911.42
6. Step 6: Final answer
   x = 2,957.25