Finding the Fourth Proportional to 1,172.28, 1,617.73 and 648.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.28 : 1,617.73 = 648.33 : x
2. Step 2: Convert to fraction form
   1,172.28/1,617.73 = 648.33/x
3. Step 3: Cross multiply
   1,172.28x = 1,617.73 × 648.33
4. Step 4: Simplify right side
   1,172.28x = 1,048,822.89
5. Step 5: Solve for x
   x = 1,048,822.89/1,172.28
6. Step 6: Final answer
   x = 894.69