Finding the Fourth Proportional to 2,081.80, 2,868.94 and 1,491.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.80 : 2,868.94 = 1,491.31 : x
2. Step 2: Convert to fraction form
   2,081.80/2,868.94 = 1,491.31/x
3. Step 3: Cross multiply
   2,081.80x = 2,868.94 × 1,491.31
4. Step 4: Simplify right side
   2,081.80x = 4,278,478.91
5. Step 5: Solve for x
   x = 4,278,478.91/2,081.80
6. Step 6: Final answer
   x = 2,055.18