Finding the Fourth Proportional to 1,144.69, 1,579.90 and 647.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,144.69 : 1,579.90 = 647.34 : x
2. Step 2: Convert to fraction form
   1,144.69/1,579.90 = 647.34/x
3. Step 3: Cross multiply
   1,144.69x = 1,579.90 × 647.34
4. Step 4: Simplify right side
   1,144.69x = 1,022,732.47
5. Step 5: Solve for x
   x = 1,022,732.47/1,144.69
6. Step 6: Final answer
   x = 893.46