Finding the Fourth Proportional to 1,418.88, 1,958.05 and 789.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.88 : 1,958.05 = 789.39 : x
2. Step 2: Convert to fraction form
   1,418.88/1,958.05 = 789.39/x
3. Step 3: Cross multiply
   1,418.88x = 1,958.05 × 789.39
4. Step 4: Simplify right side
   1,418.88x = 1,545,651.35
5. Step 5: Solve for x
   x = 1,545,651.35/1,418.88
6. Step 6: Final answer
   x = 1,089.35