Finding the Fourth Proportional to 1,144.38, 1,579.15 and 647.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.38 : 1,579.15 = 647.06 : x
2. Step 2: Convert to fraction form
   1,144.38/1,579.15 = 647.06/x
3. Step 3: Cross multiply
   1,144.38x = 1,579.15 × 647.06
4. Step 4: Simplify right side
   1,144.38x = 1,021,804.80
5. Step 5: Solve for x
   x = 1,021,804.80/1,144.38
6. Step 6: Final answer
   x = 892.89