Finding the Fourth Proportional to 1,171.92, 1,617.24 and 647.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.92 : 1,617.24 = 647.96 : x
2. Step 2: Convert to fraction form
   1,171.92/1,617.24 = 647.96/x
3. Step 3: Cross multiply
   1,171.92x = 1,617.24 × 647.96
4. Step 4: Simplify right side
   1,171.92x = 1,047,906.83
5. Step 5: Solve for x
   x = 1,047,906.83/1,171.92
6. Step 6: Final answer
   x = 894.18