Finding the Fourth Proportional to 1,086.53, 1,498.37 and 789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.53 : 1,498.37 = 789.72 : x
2. Step 2: Convert to fraction form
   1,086.53/1,498.37 = 789.72/x
3. Step 3: Cross multiply
   1,086.53x = 1,498.37 × 789.72
4. Step 4: Simplify right side
   1,086.53x = 1,183,292.76
5. Step 5: Solve for x
   x = 1,183,292.76/1,086.53
6. Step 6: Final answer
   x = 1,089.06