Finding the Fourth Proportional to 1,144.91, 1,579.96 and 647.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.91 : 1,579.96 = 647.55 : x
2. Step 2: Convert to fraction form
   1,144.91/1,579.96 = 647.55/x
3. Step 3: Cross multiply
   1,144.91x = 1,579.96 × 647.55
4. Step 4: Simplify right side
   1,144.91x = 1,023,095.20
5. Step 5: Solve for x
   x = 1,023,095.20/1,144.91
6. Step 6: Final answer
   x = 893.61