Finding the Fourth Proportional to 2,087.29, 3,131.75 and 789.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.29 : 3,131.75 = 789.67 : x
2. Step 2: Convert to fraction form
   2,087.29/3,131.75 = 789.67/x
3. Step 3: Cross multiply
   2,087.29x = 3,131.75 × 789.67
4. Step 4: Simplify right side
   2,087.29x = 2,473,049.02
5. Step 5: Solve for x
   x = 2,473,049.02/2,087.29
6. Step 6: Final answer
   x = 1,184.81