Finding the Fourth Proportional to 1,144.89, 1,578.24 and 812.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.89 : 1,578.24 = 812.25 : x
2. Step 2: Convert to fraction form
   1,144.89/1,578.24 = 812.25/x
3. Step 3: Cross multiply
   1,144.89x = 1,578.24 × 812.25
4. Step 4: Simplify right side
   1,144.89x = 1,281,925.44
5. Step 5: Solve for x
   x = 1,281,925.44/1,144.89
6. Step 6: Final answer
   x = 1,119.69