Finding the Fourth Proportional to 1,513.89, 2,271.15 and 863.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.89 : 2,271.15 = 863.28 : x
2. Step 2: Convert to fraction form
   1,513.89/2,271.15 = 863.28/x
3. Step 3: Cross multiply
   1,513.89x = 2,271.15 × 863.28
4. Step 4: Simplify right side
   1,513.89x = 1,960,638.37
5. Step 5: Solve for x
   x = 1,960,638.37/1,513.89
6. Step 6: Final answer
   x = 1,295.10