Finding the Fourth Proportional to 2,638.72, 3,958.38 and 789.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.72 : 3,958.38 = 789.94 : x
2. Step 2: Convert to fraction form
   2,638.72/3,958.38 = 789.94/x
3. Step 3: Cross multiply
   2,638.72x = 3,958.38 × 789.94
4. Step 4: Simplify right side
   2,638.72x = 3,126,882.70
5. Step 5: Solve for x
   x = 3,126,882.70/2,638.72
6. Step 6: Final answer
   x = 1,185.00