Finding the Fourth Proportional to 2,385.28, 3,576.72 and 923.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.28 : 3,576.72 = 923.68 : x
2. Step 2: Convert to fraction form
   2,385.28/3,576.72 = 923.68/x
3. Step 3: Cross multiply
   2,385.28x = 3,576.72 × 923.68
4. Step 4: Simplify right side
   2,385.28x = 3,303,744.73
5. Step 5: Solve for x
   x = 3,303,744.73/2,385.28
6. Step 6: Final answer
   x = 1,385.06