Finding the Fourth Proportional to 2,721.29, 4,081.37 and 871.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,721.29 : 4,081.37 = 871.91 : x
2. Step 2: Convert to fraction form
   2,721.29/4,081.37 = 871.91/x
3. Step 3: Cross multiply
   2,721.29x = 4,081.37 × 871.91
4. Step 4: Simplify right side
   2,721.29x = 3,558,587.32
5. Step 5: Solve for x
   x = 3,558,587.32/2,721.29
6. Step 6: Final answer
   x = 1,307.68