Finding the Fourth Proportional to 2,183.47, 3,012.67 and 1,239.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,183.47 : 3,012.67 = 1,239.05 : x
2. Step 2: Convert to fraction form
   2,183.47/3,012.67 = 1,239.05/x
3. Step 3: Cross multiply
   2,183.47x = 3,012.67 × 1,239.05
4. Step 4: Simplify right side
   2,183.47x = 3,732,856.48
5. Step 5: Solve for x
   x = 3,732,856.48/2,183.47
6. Step 6: Final answer
   x = 1,709.60