Finding the Fourth Proportional to 2,642.87, 3,647.81 and 1,581.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.87 : 3,647.81 = 1,581.26 : x
2. Step 2: Convert to fraction form
   2,642.87/3,647.81 = 1,581.26/x
3. Step 3: Cross multiply
   2,642.87x = 3,647.81 × 1,581.26
4. Step 4: Simplify right side
   2,642.87x = 5,768,142.27
5. Step 5: Solve for x
   x = 5,768,142.27/2,642.87
6. Step 6: Final answer
   x = 2,182.53