Finding the Fourth Proportional to 2,183.25, 3,012.90 and 1,188.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,183.25 : 3,012.90 = 1,188.57 : x
2. Step 2: Convert to fraction form
   2,183.25/3,012.90 = 1,188.57/x
3. Step 3: Cross multiply
   2,183.25x = 3,012.90 × 1,188.57
4. Step 4: Simplify right side
   2,183.25x = 3,581,042.55
5. Step 5: Solve for x
   x = 3,581,042.55/2,183.25
6. Step 6: Final answer
   x = 1,640.23