Finding the Fourth Proportional to 2,740.11, 4,111.53 and 1,280.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,740.11 : 4,111.53 = 1,280.31 : x
2. Step 2: Convert to fraction form
   2,740.11/4,111.53 = 1,280.31/x
3. Step 3: Cross multiply
   2,740.11x = 4,111.53 × 1,280.31
4. Step 4: Simplify right side
   2,740.11x = 5,264,032.97
5. Step 5: Solve for x
   x = 5,264,032.97/2,740.11
6. Step 6: Final answer
   x = 1,921.10