Finding the Fourth Proportional to 1,418.86, 1,958.04 and 789.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.86 : 1,958.04 = 789.42 : x
2. Step 2: Convert to fraction form
   1,418.86/1,958.04 = 789.42/x
3. Step 3: Cross multiply
   1,418.86x = 1,958.04 × 789.42
4. Step 4: Simplify right side
   1,418.86x = 1,545,715.94
5. Step 5: Solve for x
   x = 1,545,715.94/1,418.86
6. Step 6: Final answer
   x = 1,089.41