Finding the Fourth Proportional to 2,665.60, 3,993.60 and 2,281.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.60 : 3,993.60 = 2,281.60 : x
2. Step 2: Convert to fraction form
   2,665.60/3,993.60 = 2,281.60/x
3. Step 3: Cross multiply
   2,665.60x = 3,993.60 × 2,281.60
4. Step 4: Simplify right side
   2,665.60x = 9,111,797.76
5. Step 5: Solve for x
   x = 9,111,797.76/2,665.60
6. Step 6: Final answer
   x = 3,418.29