Finding the Fourth Proportional to 1,521.24, 2,279.52 and 789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.24 : 2,279.52 = 789.72 : x
2. Step 2: Convert to fraction form
   1,521.24/2,279.52 = 789.72/x
3. Step 3: Cross multiply
   1,521.24x = 2,279.52 × 789.72
4. Step 4: Simplify right side
   1,521.24x = 1,800,182.53
5. Step 5: Solve for x
   x = 1,800,182.53/1,521.24
6. Step 6: Final answer
   x = 1,183.37