Finding the Fourth Proportional to 2,721.86, 4,081.98 and 872.66

Step by Step Solution

1. Step 1: Write the proportion equation
   2,721.86 : 4,081.98 = 872.66 : x
2. Step 2: Convert to fraction form
   2,721.86/4,081.98 = 872.66/x
3. Step 3: Cross multiply
   2,721.86x = 4,081.98 × 872.66
4. Step 4: Simplify right side
   2,721.86x = 3,562,180.67
5. Step 5: Solve for x
   x = 3,562,180.67/2,721.86
6. Step 6: Final answer
   x = 1,308.73