Finding the Fourth Proportional to 1,145.84, 1,581.25 and 648.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.84 : 1,581.25 = 648.47 : x
2. Step 2: Convert to fraction form
   1,145.84/1,581.25 = 648.47/x
3. Step 3: Cross multiply
   1,145.84x = 1,581.25 × 648.47
4. Step 4: Simplify right side
   1,145.84x = 1,025,382.04
5. Step 5: Solve for x
   x = 1,025,382.04/1,145.84
6. Step 6: Final answer
   x = 894.87