Finding the Fourth Proportional to 1,145.72, 1,581.08 and 648.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.72 : 1,581.08 = 648.35 : x
2. Step 2: Convert to fraction form
   1,145.72/1,581.08 = 648.35/x
3. Step 3: Cross multiply
   1,145.72x = 1,581.08 × 648.35
4. Step 4: Simplify right side
   1,145.72x = 1,025,093.22
5. Step 5: Solve for x
   x = 1,025,093.22/1,145.72
6. Step 6: Final answer
   x = 894.72