Finding the Fourth Proportional to 2,642.79, 3,964.23 and 1,256.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.79 : 3,964.23 = 1,256.27 : x
2. Step 2: Convert to fraction form
   2,642.79/3,964.23 = 1,256.27/x
3. Step 3: Cross multiply
   2,642.79x = 3,964.23 × 1,256.27
4. Step 4: Simplify right side
   2,642.79x = 4,980,143.22
5. Step 5: Solve for x
   x = 4,980,143.22/2,642.79
6. Step 6: Final answer
   x = 1,884.43