Finding the Fourth Proportional to 2,231.24, 3,079.34 and 1,287.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.24 : 3,079.34 = 1,287.06 : x
2. Step 2: Convert to fraction form
   2,231.24/3,079.34 = 1,287.06/x
3. Step 3: Cross multiply
   2,231.24x = 3,079.34 × 1,287.06
4. Step 4: Simplify right side
   2,231.24x = 3,963,295.34
5. Step 5: Solve for x
   x = 3,963,295.34/2,231.24
6. Step 6: Final answer
   x = 1,776.27