Finding the Fourth Proportional to 2,183.51, 3,013.15 and 1,188.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,183.51 : 3,013.15 = 1,188.79 : x
2. Step 2: Convert to fraction form
   2,183.51/3,013.15 = 1,188.79/x
3. Step 3: Cross multiply
   2,183.51x = 3,013.15 × 1,188.79
4. Step 4: Simplify right side
   2,183.51x = 3,581,989.85
5. Step 5: Solve for x
   x = 3,581,989.85/2,183.51
6. Step 6: Final answer
   x = 1,640.47