Finding the Fourth Proportional to 2,578.82, 3,556.42 and 2,181.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.82 : 3,556.42 = 2,181.31 : x
2. Step 2: Convert to fraction form
   2,578.82/3,556.42 = 2,181.31/x
3. Step 3: Cross multiply
   2,578.82x = 3,556.42 × 2,181.31
4. Step 4: Simplify right side
   2,578.82x = 7,757,640.17
5. Step 5: Solve for x
   x = 7,757,640.17/2,578.82
6. Step 6: Final answer
   x = 3,008.22