Finding the Fourth Proportional to 1,418.93, 1,958.25 and 789.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.93 : 1,958.25 = 789.45 : x
2. Step 2: Convert to fraction form
   1,418.93/1,958.25 = 789.45/x
3. Step 3: Cross multiply
   1,418.93x = 1,958.25 × 789.45
4. Step 4: Simplify right side
   1,418.93x = 1,545,933.86
5. Step 5: Solve for x
   x = 1,545,933.86/1,418.93
6. Step 6: Final answer
   x = 1,089.51