Finding the Fourth Proportional to 2,575.28, 3,863.96 and 931.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,575.28 : 3,863.96 = 931.95 : x
2. Step 2: Convert to fraction form
   2,575.28/3,863.96 = 931.95/x
3. Step 3: Cross multiply
   2,575.28x = 3,863.96 × 931.95
4. Step 4: Simplify right side
   2,575.28x = 3,601,012.86
5. Step 5: Solve for x
   x = 3,601,012.86/2,575.28
6. Step 6: Final answer
   x = 1,398.30