Finding the Fourth Proportional to 1,145.85, 1,581.18 and 648.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.85 : 1,581.18 = 648.53 : x
2. Step 2: Convert to fraction form
   1,145.85/1,581.18 = 648.53/x
3. Step 3: Cross multiply
   1,145.85x = 1,581.18 × 648.53
4. Step 4: Simplify right side
   1,145.85x = 1,025,442.67
5. Step 5: Solve for x
   x = 1,025,442.67/1,145.85
6. Step 6: Final answer
   x = 894.92