Finding the Fourth Proportional to 1,146.05, 1,581.56 and 648.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.05 : 1,581.56 = 648.69 : x
2. Step 2: Convert to fraction form
   1,146.05/1,581.56 = 648.69/x
3. Step 3: Cross multiply
   1,146.05x = 1,581.56 × 648.69
4. Step 4: Simplify right side
   1,146.05x = 1,025,942.16
5. Step 5: Solve for x
   x = 1,025,942.16/1,146.05
6. Step 6: Final answer
   x = 895.20