Finding the Fourth Proportional to 3,918.04, 5,406.71 and 2,149.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,918.04 : 5,406.71 = 2,149.61 : x
2. Step 2: Convert to fraction form
   3,918.04/5,406.71 = 2,149.61/x
3. Step 3: Cross multiply
   3,918.04x = 5,406.71 × 2,149.61
4. Step 4: Simplify right side
   3,918.04x = 11,622,280.10
5. Step 5: Solve for x
   x = 11,622,280.10/3,918.04
6. Step 6: Final answer
   x = 2,966.35