Finding the Fourth Proportional to 2,087.04, 3,131.76 and 788.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.04 : 3,131.76 = 788.64 : x
2. Step 2: Convert to fraction form
   2,087.04/3,131.76 = 788.64/x
3. Step 3: Cross multiply
   2,087.04x = 3,131.76 × 788.64
4. Step 4: Simplify right side
   2,087.04x = 2,469,831.21
5. Step 5: Solve for x
   x = 2,469,831.21/2,087.04
6. Step 6: Final answer
   x = 1,183.41