Finding the Fourth Proportional to 2,863.71, 4,295.48 and 915.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,863.71 : 4,295.48 = 915.87 : x
2. Step 2: Convert to fraction form
   2,863.71/4,295.48 = 915.87/x
3. Step 3: Cross multiply
   2,863.71x = 4,295.48 × 915.87
4. Step 4: Simplify right side
   2,863.71x = 3,934,096.69
5. Step 5: Solve for x
   x = 3,934,096.69/2,863.71
6. Step 6: Final answer
   x = 1,373.78