Finding the Fourth Proportional to 2,736.86, 4,105.49 and 789.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,736.86 : 4,105.49 = 789.21 : x
2. Step 2: Convert to fraction form
   2,736.86/4,105.49 = 789.21/x
3. Step 3: Cross multiply
   2,736.86x = 4,105.49 × 789.21
4. Step 4: Simplify right side
   2,736.86x = 3,240,089.82
5. Step 5: Solve for x
   x = 3,240,089.82/2,736.86
6. Step 6: Final answer
   x = 1,183.87