Finding the Fourth Proportional to 2,817.15, 4,224.51 and 868.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,817.15 : 4,224.51 = 868.91 : x
2. Step 2: Convert to fraction form
   2,817.15/4,224.51 = 868.91/x
3. Step 3: Cross multiply
   2,817.15x = 4,224.51 × 868.91
4. Step 4: Simplify right side
   2,817.15x = 3,670,697.86
5. Step 5: Solve for x
   x = 3,670,697.86/2,817.15
6. Step 6: Final answer
   x = 1,302.98