Finding the Fourth Proportional to 1,145.89, 1,581.36 and 648.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.89 : 1,581.36 = 648.49 : x
2. Step 2: Convert to fraction form
   1,145.89/1,581.36 = 648.49/x
3. Step 3: Cross multiply
   1,145.89x = 1,581.36 × 648.49
4. Step 4: Simplify right side
   1,145.89x = 1,025,496.15
5. Step 5: Solve for x
   x = 1,025,496.15/1,145.89
6. Step 6: Final answer
   x = 894.93