Finding the Fourth Proportional to 1,144.37, 1,579.41 and 647.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.37 : 1,579.41 = 647.15 : x
2. Step 2: Convert to fraction form
   1,144.37/1,579.41 = 647.15/x
3. Step 3: Cross multiply
   1,144.37x = 1,579.41 × 647.15
4. Step 4: Simplify right side
   1,144.37x = 1,022,107.28
5. Step 5: Solve for x
   x = 1,022,107.28/1,144.37
6. Step 6: Final answer
   x = 893.17