Finding the Fourth Proportional to 1,172.12, 1,617.42 and 648.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.12 : 1,617.42 = 648.18 : x
2. Step 2: Convert to fraction form
   1,172.12/1,617.42 = 648.18/x
3. Step 3: Cross multiply
   1,172.12x = 1,617.42 × 648.18
4. Step 4: Simplify right side
   1,172.12x = 1,048,379.30
5. Step 5: Solve for x
   x = 1,048,379.30/1,172.12
6. Step 6: Final answer
   x = 894.43