Finding the Fourth Proportional to 2,411.50, 3,617.61 and 872.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,411.50 : 3,617.61 = 872.86 : x
2. Step 2: Convert to fraction form
   2,411.50/3,617.61 = 872.86/x
3. Step 3: Cross multiply
   2,411.50x = 3,617.61 × 872.86
4. Step 4: Simplify right side
   2,411.50x = 3,157,667.06
5. Step 5: Solve for x
   x = 3,157,667.06/2,411.50
6. Step 6: Final answer
   x = 1,309.42