Finding the Fourth Proportional to 2,581.56, 3,561.21 and 1,635.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,581.56 : 3,561.21 = 1,635.72 : x
2. Step 2: Convert to fraction form
   2,581.56/3,561.21 = 1,635.72/x
3. Step 3: Cross multiply
   2,581.56x = 3,561.21 × 1,635.72
4. Step 4: Simplify right side
   2,581.56x = 5,825,142.42
5. Step 5: Solve for x
   x = 5,825,142.42/2,581.56
6. Step 6: Final answer
   x = 2,256.44