Finding the Fourth Proportional to 1,144.65, 1,579.47 and 647.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.65 : 1,579.47 = 647.31 : x
2. Step 2: Convert to fraction form
   1,144.65/1,579.47 = 647.31/x
3. Step 3: Cross multiply
   1,144.65x = 1,579.47 × 647.31
4. Step 4: Simplify right side
   1,144.65x = 1,022,406.73
5. Step 5: Solve for x
   x = 1,022,406.73/1,144.65
6. Step 6: Final answer
   x = 893.20