Finding the Fourth Proportional to 2,642.88, 3,963.36 and 1,256.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.88 : 3,963.36 = 1,256.16 : x
2. Step 2: Convert to fraction form
   2,642.88/3,963.36 = 1,256.16/x
3. Step 3: Cross multiply
   2,642.88x = 3,963.36 × 1,256.16
4. Step 4: Simplify right side
   2,642.88x = 4,978,614.30
5. Step 5: Solve for x
   x = 4,978,614.30/2,642.88
6. Step 6: Final answer
   x = 1,883.78