Finding the Fourth Proportional to 2,638.45, 3,957.93 and 789.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.45 : 3,957.93 = 789.22 : x
2. Step 2: Convert to fraction form
   2,638.45/3,957.93 = 789.22/x
3. Step 3: Cross multiply
   2,638.45x = 3,957.93 × 789.22
4. Step 4: Simplify right side
   2,638.45x = 3,123,677.51
5. Step 5: Solve for x
   x = 3,123,677.51/2,638.45
6. Step 6: Final answer
   x = 1,183.91