Finding the Fourth Proportional to 2,087.74, 3,130.98 and 788.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.74 : 3,130.98 = 788.89 : x
2. Step 2: Convert to fraction form
   2,087.74/3,130.98 = 788.89/x
3. Step 3: Cross multiply
   2,087.74x = 3,130.98 × 788.89
4. Step 4: Simplify right side
   2,087.74x = 2,469,998.81
5. Step 5: Solve for x
   x = 2,469,998.81/2,087.74
6. Step 6: Final answer
   x = 1,183.10