Finding the Fourth Proportional to 2,871.27, 4,307.31 and 923.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,871.27 : 4,307.31 = 923.76 : x
2. Step 2: Convert to fraction form
   2,871.27/4,307.31 = 923.76/x
3. Step 3: Cross multiply
   2,871.27x = 4,307.31 × 923.76
4. Step 4: Simplify right side
   2,871.27x = 3,978,920.69
5. Step 5: Solve for x
   x = 3,978,920.69/2,871.27
6. Step 6: Final answer
   x = 1,385.77