Finding the Fourth Proportional to 2,231.39, 3,079.27 and 1,287.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.39 : 3,079.27 = 1,287.18 : x
2. Step 2: Convert to fraction form
   2,231.39/3,079.27 = 1,287.18/x
3. Step 3: Cross multiply
   2,231.39x = 3,079.27 × 1,287.18
4. Step 4: Simplify right side
   2,231.39x = 3,963,579.24
5. Step 5: Solve for x
   x = 3,963,579.24/2,231.39
6. Step 6: Final answer
   x = 1,776.28