Finding the Fourth Proportional to 2,638.32, 3,957.70 and 789.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.32 : 3,957.70 = 789.30 : x
2. Step 2: Convert to fraction form
   2,638.32/3,957.70 = 789.30/x
3. Step 3: Cross multiply
   2,638.32x = 3,957.70 × 789.30
4. Step 4: Simplify right side
   2,638.32x = 3,123,812.61
5. Step 5: Solve for x
   x = 3,123,812.61/2,638.32
6. Step 6: Final answer
   x = 1,184.02