Finding the Fourth Proportional to 1,144.62, 1,578.86 and 845.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.62 : 1,578.86 = 845.56 : x
2. Step 2: Convert to fraction form
   1,144.62/1,578.86 = 845.56/x
3. Step 3: Cross multiply
   1,144.62x = 1,578.86 × 845.56
4. Step 4: Simplify right side
   1,144.62x = 1,335,020.86
5. Step 5: Solve for x
   x = 1,335,020.86/1,144.62
6. Step 6: Final answer
   x = 1,166.34