Finding the Fourth Proportional to 2,123.54, 3,179.41 and 1,081.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.54 : 3,179.41 = 1,081.31 : x
2. Step 2: Convert to fraction form
   2,123.54/3,179.41 = 1,081.31/x
3. Step 3: Cross multiply
   2,123.54x = 3,179.41 × 1,081.31
4. Step 4: Simplify right side
   2,123.54x = 3,437,909.23
5. Step 5: Solve for x
   x = 3,437,909.23/2,123.54
6. Step 6: Final answer
   x = 1,618.95