Finding the Fourth Proportional to 1,145.48, 1,580.85 and 648.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.48 : 1,580.85 = 648.17 : x
2. Step 2: Convert to fraction form
   1,145.48/1,580.85 = 648.17/x
3. Step 3: Cross multiply
   1,145.48x = 1,580.85 × 648.17
4. Step 4: Simplify right side
   1,145.48x = 1,024,659.54
5. Step 5: Solve for x
   x = 1,024,659.54/1,145.48
6. Step 6: Final answer
   x = 894.52