Finding the Fourth Proportional to 3,826.50, 5,280.55 and 2,147.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,826.50 : 5,280.55 = 2,147.91 : x
2. Step 2: Convert to fraction form
   3,826.50/5,280.55 = 2,147.91/x
3. Step 3: Cross multiply
   3,826.50x = 5,280.55 × 2,147.91
4. Step 4: Simplify right side
   3,826.50x = 11,342,146.15
5. Step 5: Solve for x
   x = 11,342,146.15/3,826.50
6. Step 6: Final answer
   x = 2,964.10