Finding the Fourth Proportional to 2,581.82, 3,872.32 and 2,145.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,581.82 : 3,872.32 = 2,145.87 : x
2. Step 2: Convert to fraction form
   2,581.82/3,872.32 = 2,145.87/x
3. Step 3: Cross multiply
   2,581.82x = 3,872.32 × 2,145.87
4. Step 4: Simplify right side
   2,581.82x = 8,309,465.23
5. Step 5: Solve for x
   x = 8,309,465.23/2,581.82
6. Step 6: Final answer
   x = 3,218.46