Finding the Fourth Proportional to 2,087.45, 3,130.91 and 788.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.45 : 3,130.91 = 788.75 : x
2. Step 2: Convert to fraction form
   2,087.45/3,130.91 = 788.75/x
3. Step 3: Cross multiply
   2,087.45x = 3,130.91 × 788.75
4. Step 4: Simplify right side
   2,087.45x = 2,469,501.32
5. Step 5: Solve for x
   x = 2,469,501.32/2,087.45
6. Step 6: Final answer
   x = 1,183.02