Finding the Fourth Proportional to 2,087.09, 3,131.10 and 788.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.09 : 3,131.10 = 788.57 : x
2. Step 2: Convert to fraction form
   2,087.09/3,131.10 = 788.57/x
3. Step 3: Cross multiply
   2,087.09x = 3,131.10 × 788.57
4. Step 4: Simplify right side
   2,087.09x = 2,469,091.53
5. Step 5: Solve for x
   x = 2,469,091.53/2,087.09
6. Step 6: Final answer
   x = 1,183.03