Finding the Fourth Proportional to 2,231.27, 3,079.58 and 1,287.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,231.27 : 3,079.58 = 1,287.67 : x
2. Step 2: Convert to fraction form
   2,231.27/3,079.58 = 1,287.67/x
3. Step 3: Cross multiply
   2,231.27x = 3,079.58 × 1,287.67
4. Step 4: Simplify right side
   2,231.27x = 3,965,482.78
5. Step 5: Solve for x
   x = 3,965,482.78/2,231.27
6. Step 6: Final answer
   x = 1,777.24