Finding the Fourth Proportional to 2,573.78, 3,859.92 and 1,256.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,573.78 : 3,859.92 = 1,256.72 : x
2. Step 2: Convert to fraction form
   2,573.78/3,859.92 = 1,256.72/x
3. Step 3: Cross multiply
   2,573.78x = 3,859.92 × 1,256.72
4. Step 4: Simplify right side
   2,573.78x = 4,850,819.36
5. Step 5: Solve for x
   x = 4,850,819.36/2,573.78
6. Step 6: Final answer
   x = 1,884.71