Finding the Fourth Proportional to 3,826.30, 5,280.15 and 2,147.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,826.30 : 5,280.15 = 2,147.80 : x
2. Step 2: Convert to fraction form
   3,826.30/5,280.15 = 2,147.80/x
3. Step 3: Cross multiply
   3,826.30x = 5,280.15 × 2,147.80
4. Step 4: Simplify right side
   3,826.30x = 11,340,706.17
5. Step 5: Solve for x
   x = 11,340,706.17/3,826.30
6. Step 6: Final answer
   x = 2,963.88