Finding the Fourth Proportional to 2,638.48, 3,957.82 and 789.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.48 : 3,957.82 = 789.62 : x
2. Step 2: Convert to fraction form
   2,638.48/3,957.82 = 789.62/x
3. Step 3: Cross multiply
   2,638.48x = 3,957.82 × 789.62
4. Step 4: Simplify right side
   2,638.48x = 3,125,173.83
5. Step 5: Solve for x
   x = 3,125,173.83/2,638.48
6. Step 6: Final answer
   x = 1,184.46