Finding the Fourth Proportional to 2,428.99, 3,640.66 and 1,040.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,428.99 : 3,640.66 = 1,040.25 : x
2. Step 2: Convert to fraction form
   2,428.99/3,640.66 = 1,040.25/x
3. Step 3: Cross multiply
   2,428.99x = 3,640.66 × 1,040.25
4. Step 4: Simplify right side
   2,428.99x = 3,787,196.57
5. Step 5: Solve for x
   x = 3,787,196.57/2,428.99
6. Step 6: Final answer
   x = 1,559.17