Finding the Fourth Proportional to 2,942.98, 4,415.15 and 863.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,942.98 : 4,415.15 = 863.15 : x
2. Step 2: Convert to fraction form
   2,942.98/4,415.15 = 863.15/x
3. Step 3: Cross multiply
   2,942.98x = 4,415.15 × 863.15
4. Step 4: Simplify right side
   2,942.98x = 3,810,916.80
5. Step 5: Solve for x
   x = 3,810,916.80/2,942.98
6. Step 6: Final answer
   x = 1,294.92