Finding the Fourth Proportional to 1,144.89, 1,580.04 and 647.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.89 : 1,580.04 = 647.61 : x
2. Step 2: Convert to fraction form
   1,144.89/1,580.04 = 647.61/x
3. Step 3: Cross multiply
   1,144.89x = 1,580.04 × 647.61
4. Step 4: Simplify right side
   1,144.89x = 1,023,249.70
5. Step 5: Solve for x
   x = 1,023,249.70/1,144.89
6. Step 6: Final answer
   x = 893.75