Finding the Fourth Proportional to 1,144.78, 1,580.76 and 851.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.78 : 1,580.76 = 851.36 : x
2. Step 2: Convert to fraction form
   1,144.78/1,580.76 = 851.36/x
3. Step 3: Cross multiply
   1,144.78x = 1,580.76 × 851.36
4. Step 4: Simplify right side
   1,144.78x = 1,345,789.75
5. Step 5: Solve for x
   x = 1,345,789.75/1,144.78
6. Step 6: Final answer
   x = 1,175.59