Finding the Fourth Proportional to 2,183.20, 3,012.72 and 1,188.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,183.20 : 3,012.72 = 1,188.45 : x
2. Step 2: Convert to fraction form
   2,183.20/3,012.72 = 1,188.45/x
3. Step 3: Cross multiply
   2,183.20x = 3,012.72 × 1,188.45
4. Step 4: Simplify right side
   2,183.20x = 3,580,471.64
5. Step 5: Solve for x
   x = 3,580,471.64/2,183.20
6. Step 6: Final answer
   x = 1,640.01