Finding the Fourth Proportional to 789.89, 1,089.42 and 540.82

Step by Step Solution

1. Step 1: Write the proportion equation
   789.89 : 1,089.42 = 540.82 : x
2. Step 2: Convert to fraction form
   789.89/1,089.42 = 540.82/x
3. Step 3: Cross multiply
   789.89x = 1,089.42 × 540.82
4. Step 4: Simplify right side
   789.89x = 589,177.40
5. Step 5: Solve for x
   x = 589,177.40/789.89
6. Step 6: Final answer
   x = 745.90