Finding the Fourth Proportional to 1,172.25, 1,617.74 and 648.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.25 : 1,617.74 = 648.38 : x
2. Step 2: Convert to fraction form
   1,172.25/1,617.74 = 648.38/x
3. Step 3: Cross multiply
   1,172.25x = 1,617.74 × 648.38
4. Step 4: Simplify right side
   1,172.25x = 1,048,915.93
5. Step 5: Solve for x
   x = 1,048,915.93/1,172.25
6. Step 6: Final answer
   x = 894.79