Finding the Fourth Proportional to 2,123.81, 3,183.31 and 1,081.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.81 : 3,183.31 = 1,081.61 : x
2. Step 2: Convert to fraction form
   2,123.81/3,183.31 = 1,081.61/x
3. Step 3: Cross multiply
   2,123.81x = 3,183.31 × 1,081.61
4. Step 4: Simplify right side
   2,123.81x = 3,443,089.27
5. Step 5: Solve for x
   x = 3,443,089.27/2,123.81
6. Step 6: Final answer
   x = 1,621.19