Finding the Fourth Proportional to 3,928.83, 5,421.71 and 2,160.41

Step by Step Solution

1. Step 1: Write the proportion equation
   3,928.83 : 5,421.71 = 2,160.41 : x
2. Step 2: Convert to fraction form
   3,928.83/5,421.71 = 2,160.41/x
3. Step 3: Cross multiply
   3,928.83x = 5,421.71 × 2,160.41
4. Step 4: Simplify right side
   3,928.83x = 11,713,078.59
5. Step 5: Solve for x
   x = 11,713,078.59/3,928.83
6. Step 6: Final answer
   x = 2,981.31