Finding the Fourth Proportional to 1,418.72, 1,957.77 and 789.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.72 : 1,957.77 = 789.23 : x
2. Step 2: Convert to fraction form
   1,418.72/1,957.77 = 789.23/x
3. Step 3: Cross multiply
   1,418.72x = 1,957.77 × 789.23
4. Step 4: Simplify right side
   1,418.72x = 1,545,135.71
5. Step 5: Solve for x
   x = 1,545,135.71/1,418.72
6. Step 6: Final answer
   x = 1,089.11