Finding the Fourth Proportional to 1,418.53, 1,957.60 and 789.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.53 : 1,957.60 = 789.13 : x
2. Step 2: Convert to fraction form
   1,418.53/1,957.60 = 789.13/x
3. Step 3: Cross multiply
   1,418.53x = 1,957.60 × 789.13
4. Step 4: Simplify right side
   1,418.53x = 1,544,800.89
5. Step 5: Solve for x
   x = 1,544,800.89/1,418.53
6. Step 6: Final answer
   x = 1,089.02