Finding the Fourth Proportional to 1,145.69, 1,581.10 and 648.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.69 : 1,581.10 = 648.32 : x
2. Step 2: Convert to fraction form
   1,145.69/1,581.10 = 648.32/x
3. Step 3: Cross multiply
   1,145.69x = 1,581.10 × 648.32
4. Step 4: Simplify right side
   1,145.69x = 1,025,061.08
5. Step 5: Solve for x
   x = 1,025,061.08/1,145.69
6. Step 6: Final answer
   x = 894.71