Finding the Fourth Proportional to 1,144.40, 1,579.32 and 647.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.40 : 1,579.32 = 647.12 : x
2. Step 2: Convert to fraction form
   1,144.40/1,579.32 = 647.12/x
3. Step 3: Cross multiply
   1,144.40x = 1,579.32 × 647.12
4. Step 4: Simplify right side
   1,144.40x = 1,022,009.56
5. Step 5: Solve for x
   x = 1,022,009.56/1,144.40
6. Step 6: Final answer
   x = 893.05