Finding the Fourth Proportional to 3,906.31, 5,390.71 and 2,137.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.31 : 5,390.71 = 2,137.91 : x
2. Step 2: Convert to fraction form
   3,906.31/5,390.71 = 2,137.91/x
3. Step 3: Cross multiply
   3,906.31x = 5,390.71 × 2,137.91
4. Step 4: Simplify right side
   3,906.31x = 11,524,852.82
5. Step 5: Solve for x
   x = 11,524,852.82/3,906.31
6. Step 6: Final answer
   x = 2,950.32