Finding the Fourth Proportional to 1,145.88, 1,581.19 and 648.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.88 : 1,581.19 = 648.51 : x
2. Step 2: Convert to fraction form
   1,145.88/1,581.19 = 648.51/x
3. Step 3: Cross multiply
   1,145.88x = 1,581.19 × 648.51
4. Step 4: Simplify right side
   1,145.88x = 1,025,411.34
5. Step 5: Solve for x
   x = 1,025,411.34/1,145.88
6. Step 6: Final answer
   x = 894.87