Finding the Fourth Proportional to 2,550.36, 3,518.56 and 1,605.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.36 : 3,518.56 = 1,605.72 : x
2. Step 2: Convert to fraction form
   2,550.36/3,518.56 = 1,605.72/x
3. Step 3: Cross multiply
   2,550.36x = 3,518.56 × 1,605.72
4. Step 4: Simplify right side
   2,550.36x = 5,649,822.16
5. Step 5: Solve for x
   x = 5,649,822.16/2,550.36
6. Step 6: Final answer
   x = 2,215.30