Finding the Fourth Proportional to 2,639.42, 3,960.27 and 1,253.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.42 : 3,960.27 = 1,253.73 : x
2. Step 2: Convert to fraction form
   2,639.42/3,960.27 = 1,253.73/x
3. Step 3: Cross multiply
   2,639.42x = 3,960.27 × 1,253.73
4. Step 4: Simplify right side
   2,639.42x = 4,965,109.31
5. Step 5: Solve for x
   x = 4,965,109.31/2,639.42
6. Step 6: Final answer
   x = 1,881.14