Finding the Fourth Proportional to 1,418.68, 1,957.60 and 789.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.68 : 1,957.60 = 789.24 : x
2. Step 2: Convert to fraction form
   1,418.68/1,957.60 = 789.24/x
3. Step 3: Cross multiply
   1,418.68x = 1,957.60 × 789.24
4. Step 4: Simplify right side
   1,418.68x = 1,545,016.22
5. Step 5: Solve for x
   x = 1,545,016.22/1,418.68
6. Step 6: Final answer
   x = 1,089.05