Finding the Fourth Proportional to 2,638.47, 3,958.22 and 789.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.47 : 3,958.22 = 789.43 : x
2. Step 2: Convert to fraction form
   2,638.47/3,958.22 = 789.43/x
3. Step 3: Cross multiply
   2,638.47x = 3,958.22 × 789.43
4. Step 4: Simplify right side
   2,638.47x = 3,124,726.73
5. Step 5: Solve for x
   x = 3,124,726.73/2,638.47
6. Step 6: Final answer
   x = 1,184.29