Finding the Fourth Proportional to 2,581.20, 3,560.72 and 1,635.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,581.20 : 3,560.72 = 1,635.40 : x
2. Step 2: Convert to fraction form
   2,581.20/3,560.72 = 1,635.40/x
3. Step 3: Cross multiply
   2,581.20x = 3,560.72 × 1,635.40
4. Step 4: Simplify right side
   2,581.20x = 5,823,201.49
5. Step 5: Solve for x
   x = 5,823,201.49/2,581.20
6. Step 6: Final answer
   x = 2,256.01