Finding the Fourth Proportional to 2,596.81, 3,891.42 and 1,280.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,596.81 : 3,891.42 = 1,280.17 : x
2. Step 2: Convert to fraction form
   2,596.81/3,891.42 = 1,280.17/x
3. Step 3: Cross multiply
   2,596.81x = 3,891.42 × 1,280.17
4. Step 4: Simplify right side
   2,596.81x = 4,981,679.14
5. Step 5: Solve for x
   x = 4,981,679.14/2,596.81
6. Step 6: Final answer
   x = 1,918.38