Finding the Fourth Proportional to 1,172.39, 1,617.98 and 648.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.39 : 1,617.98 = 648.41 : x
2. Step 2: Convert to fraction form
   1,172.39/1,617.98 = 648.41/x
3. Step 3: Cross multiply
   1,172.39x = 1,617.98 × 648.41
4. Step 4: Simplify right side
   1,172.39x = 1,049,103.08
5. Step 5: Solve for x
   x = 1,049,103.08/1,172.39
6. Step 6: Final answer
   x = 894.85