Finding the Fourth Proportional to 3,826.41, 5,280.42 and 2,147.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,826.41 : 5,280.42 = 2,147.78 : x
2. Step 2: Convert to fraction form
   3,826.41/5,280.42 = 2,147.78/x
3. Step 3: Cross multiply
   3,826.41x = 5,280.42 × 2,147.78
4. Step 4: Simplify right side
   3,826.41x = 11,341,201.72
5. Step 5: Solve for x
   x = 11,341,201.72/3,826.41
6. Step 6: Final answer
   x = 2,963.93