Finding the Fourth Proportional to 3,949.02, 5,921.37 and 2,100.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,949.02 : 5,921.37 = 2,100.87 : x
2. Step 2: Convert to fraction form
   3,949.02/5,921.37 = 2,100.87/x
3. Step 3: Cross multiply
   3,949.02x = 5,921.37 × 2,100.87
4. Step 4: Simplify right side
   3,949.02x = 12,440,028.59
5. Step 5: Solve for x
   x = 12,440,028.59/3,949.02
6. Step 6: Final answer
   x = 3,150.16