Finding the Fourth Proportional to 2,388.79, 3,582.28 and 1,139.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,388.79 : 3,582.28 = 1,139.16 : x
2. Step 2: Convert to fraction form
   2,388.79/3,582.28 = 1,139.16/x
3. Step 3: Cross multiply
   2,388.79x = 3,582.28 × 1,139.16
4. Step 4: Simplify right side
   2,388.79x = 4,080,798.53
5. Step 5: Solve for x
   x = 4,080,798.53/2,388.79
6. Step 6: Final answer
   x = 1,708.31