Finding the Fourth Proportional to 2,123.31, 3,183.51 and 1,081.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.31 : 3,183.51 = 1,081.30 : x
2. Step 2: Convert to fraction form
   2,123.31/3,183.51 = 1,081.30/x
3. Step 3: Cross multiply
   2,123.31x = 3,183.51 × 1,081.30
4. Step 4: Simplify right side
   2,123.31x = 3,442,320.13
5. Step 5: Solve for x
   x = 3,442,320.13/2,123.31
6. Step 6: Final answer
   x = 1,621.20