Finding the Fourth Proportional to 3,979.59, 5,491.89 and 2,211.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,979.59 : 5,491.89 = 2,211.15 : x
2. Step 2: Convert to fraction form
   3,979.59/5,491.89 = 2,211.15/x
3. Step 3: Cross multiply
   3,979.59x = 5,491.89 × 2,211.15
4. Step 4: Simplify right side
   3,979.59x = 12,143,392.57
5. Step 5: Solve for x
   x = 12,143,392.57/3,979.59
6. Step 6: Final answer
   x = 3,051.42