Finding the Fourth Proportional to 2,638.01, 3,957.06 and 789.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.01 : 3,957.06 = 789.15 : x
2. Step 2: Convert to fraction form
   2,638.01/3,957.06 = 789.15/x
3. Step 3: Cross multiply
   2,638.01x = 3,957.06 × 789.15
4. Step 4: Simplify right side
   2,638.01x = 3,122,731.70
5. Step 5: Solve for x
   x = 3,122,731.70/2,638.01
6. Step 6: Final answer
   x = 1,183.74