Finding the Fourth Proportional to 1,145.96, 1,581.15 and 648.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.96 : 1,581.15 = 648.49 : x
2. Step 2: Convert to fraction form
   1,145.96/1,581.15 = 648.49/x
3. Step 3: Cross multiply
   1,145.96x = 1,581.15 × 648.49
4. Step 4: Simplify right side
   1,145.96x = 1,025,352.06
5. Step 5: Solve for x
   x = 1,025,352.06/1,145.96
6. Step 6: Final answer
   x = 894.76