Finding the Fourth Proportional to 2,550.40, 3,519.72 and 1,431.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,550.40 : 3,519.72 = 1,431.42 : x
2. Step 2: Convert to fraction form
   2,550.40/3,519.72 = 1,431.42/x
3. Step 3: Cross multiply
   2,550.40x = 3,519.72 × 1,431.42
4. Step 4: Simplify right side
   2,550.40x = 5,038,197.60
5. Step 5: Solve for x
   x = 5,038,197.60/2,550.40
6. Step 6: Final answer
   x = 1,975.45