Finding the Fourth Proportional to 1,145.92, 1,581.38 and 648.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.92 : 1,581.38 = 648.56 : x
2. Step 2: Convert to fraction form
   1,145.92/1,581.38 = 648.56/x
3. Step 3: Cross multiply
   1,145.92x = 1,581.38 × 648.56
4. Step 4: Simplify right side
   1,145.92x = 1,025,619.81
5. Step 5: Solve for x
   x = 1,025,619.81/1,145.92
6. Step 6: Final answer
   x = 895.02