Finding the Fourth Proportional to 2,550.25, 3,518.28 and 1,555.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.25 : 3,518.28 = 1,555.15 : x
2. Step 2: Convert to fraction form
   2,550.25/3,518.28 = 1,555.15/x
3. Step 3: Cross multiply
   2,550.25x = 3,518.28 × 1,555.15
4. Step 4: Simplify right side
   2,550.25x = 5,471,453.14
5. Step 5: Solve for x
   x = 5,471,453.14/2,550.25
6. Step 6: Final answer
   x = 2,145.46