Finding the Fourth Proportional to 3,979.15, 5,491.15 and 2,210.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,979.15 : 5,491.15 = 2,210.71 : x
2. Step 2: Convert to fraction form
   3,979.15/5,491.15 = 2,210.71/x
3. Step 3: Cross multiply
   3,979.15x = 5,491.15 × 2,210.71
4. Step 4: Simplify right side
   3,979.15x = 12,139,340.22
5. Step 5: Solve for x
   x = 12,139,340.22/3,979.15
6. Step 6: Final answer
   x = 3,050.74