Finding the Fourth Proportional to 2,863.78, 4,294.18 and 915.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,863.78 : 4,294.18 = 915.73 : x
2. Step 2: Convert to fraction form
   2,863.78/4,294.18 = 915.73/x
3. Step 3: Cross multiply
   2,863.78x = 4,294.18 × 915.73
4. Step 4: Simplify right side
   2,863.78x = 3,932,309.45
5. Step 5: Solve for x
   x = 3,932,309.45/2,863.78
6. Step 6: Final answer
   x = 1,373.12