Finding the Fourth Proportional to 2,721.50, 4,081.33 and 1,078.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,721.50 : 4,081.33 = 1,078.61 : x
2. Step 2: Convert to fraction form
   2,721.50/4,081.33 = 1,078.61/x
3. Step 3: Cross multiply
   2,721.50x = 4,081.33 × 1,078.61
4. Step 4: Simplify right side
   2,721.50x = 4,402,157.96
5. Step 5: Solve for x
   x = 4,402,157.96/2,721.50
6. Step 6: Final answer
   x = 1,617.55