Finding the Fourth Proportional to 2,411.72, 3,616.86 and 872.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,411.72 : 3,616.86 = 872.36 : x
2. Step 2: Convert to fraction form
   2,411.72/3,616.86 = 872.36/x
3. Step 3: Cross multiply
   2,411.72x = 3,616.86 × 872.36
4. Step 4: Simplify right side
   2,411.72x = 3,155,203.99
5. Step 5: Solve for x
   x = 3,155,203.99/2,411.72
6. Step 6: Final answer
   x = 1,308.28