Finding the Fourth Proportional to 1,172.18, 1,617.37 and 648.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.18 : 1,617.37 = 648.11 : x
2. Step 2: Convert to fraction form
   1,172.18/1,617.37 = 648.11/x
3. Step 3: Cross multiply
   1,172.18x = 1,617.37 × 648.11
4. Step 4: Simplify right side
   1,172.18x = 1,048,223.96
5. Step 5: Solve for x
   x = 1,048,223.96/1,172.18
6. Step 6: Final answer
   x = 894.26