Finding the Fourth Proportional to 2,183.12, 3,012.72 and 1,238.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,183.12 : 3,012.72 = 1,238.96 : x
2. Step 2: Convert to fraction form
   2,183.12/3,012.72 = 1,238.96/x
3. Step 3: Cross multiply
   2,183.12x = 3,012.72 × 1,238.96
4. Step 4: Simplify right side
   2,183.12x = 3,732,639.57
5. Step 5: Solve for x
   x = 3,732,639.57/2,183.12
6. Step 6: Final answer
   x = 1,709.77