Finding the Fourth Proportional to 2,721.33, 4,078.89 and 1,257.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,721.33 : 4,078.89 = 1,257.39 : x
2. Step 2: Convert to fraction form
   2,721.33/4,078.89 = 1,257.39/x
3. Step 3: Cross multiply
   2,721.33x = 4,078.89 × 1,257.39
4. Step 4: Simplify right side
   2,721.33x = 5,128,755.50
5. Step 5: Solve for x
   x = 5,128,755.50/2,721.33
6. Step 6: Final answer
   x = 1,884.65