Finding the Fourth Proportional to 1,172.25, 1,617.71 and 648.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.25 : 1,617.71 = 648.28 : x
2. Step 2: Convert to fraction form
   1,172.25/1,617.71 = 648.28/x
3. Step 3: Cross multiply
   1,172.25x = 1,617.71 × 648.28
4. Step 4: Simplify right side
   1,172.25x = 1,048,727.82
5. Step 5: Solve for x
   x = 1,048,727.82/1,172.25
6. Step 6: Final answer
   x = 894.63