Finding the Fourth Proportional to 3,826.72, 5,280.55 and 2,147.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,826.72 : 5,280.55 = 2,147.90 : x
2. Step 2: Convert to fraction form
   3,826.72/5,280.55 = 2,147.90/x
3. Step 3: Cross multiply
   3,826.72x = 5,280.55 × 2,147.90
4. Step 4: Simplify right side
   3,826.72x = 11,342,093.35
5. Step 5: Solve for x
   x = 11,342,093.35/3,826.72
6. Step 6: Final answer
   x = 2,963.92