Finding the Fourth Proportional to 2,147.10, 3,214.89 and 1,280.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.10 : 3,214.89 = 1,280.22 : x
2. Step 2: Convert to fraction form
   2,147.10/3,214.89 = 1,280.22/x
3. Step 3: Cross multiply
   2,147.10x = 3,214.89 × 1,280.22
4. Step 4: Simplify right side
   2,147.10x = 4,115,766.48
5. Step 5: Solve for x
   x = 4,115,766.48/2,147.10
6. Step 6: Final answer
   x = 1,916.90