Finding the Fourth Proportional to 2,613, 3,919.82 and 789

Step by Step Solution

1. Step 1: Write the proportion equation
   2,613 : 3,919.82 = 789 : x
2. Step 2: Convert to fraction form
   2,613/3,919.82 = 789/x
3. Step 3: Cross multiply
   2,613x = 3,919.82 × 789
4. Step 4: Simplify right side
   2,613x = 3,092,737.98
5. Step 5: Solve for x
   x = 3,092,737.98/2,613
6. Step 6: Final answer
   x = 1,183.60