Finding the Fourth Proportional to 2,615.36, 3,923.60 and 885.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.36 : 3,923.60 = 885.12 : x
2. Step 2: Convert to fraction form
   2,615.36/3,923.60 = 885.12/x
3. Step 3: Cross multiply
   2,615.36x = 3,923.60 × 885.12
4. Step 4: Simplify right side
   2,615.36x = 3,472,856.83
5. Step 5: Solve for x
   x = 3,472,856.83/2,615.36
6. Step 6: Final answer
   x = 1,327.87