Finding the Fourth Proportional to 1,144.90, 1,579.94 and 647.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.90 : 1,579.94 = 647.53 : x
2. Step 2: Convert to fraction form
   1,144.90/1,579.94 = 647.53/x
3. Step 3: Cross multiply
   1,144.90x = 1,579.94 × 647.53
4. Step 4: Simplify right side
   1,144.90x = 1,023,058.55
5. Step 5: Solve for x
   x = 1,023,058.55/1,144.90
6. Step 6: Final answer
   x = 893.58