Finding the Fourth Proportional to 1,144.89, 1,579.98 and 647.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.89 : 1,579.98 = 647.49 : x
2. Step 2: Convert to fraction form
   1,144.89/1,579.98 = 647.49/x
3. Step 3: Cross multiply
   1,144.89x = 1,579.98 × 647.49
4. Step 4: Simplify right side
   1,144.89x = 1,023,021.25
5. Step 5: Solve for x
   x = 1,023,021.25/1,144.89
6. Step 6: Final answer
   x = 893.55