Finding the Fourth Proportional to 1,162.18, 1,603.81 and 664.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.18 : 1,603.81 = 664.80 : x
2. Step 2: Convert to fraction form
   1,162.18/1,603.81 = 664.80/x
3. Step 3: Cross multiply
   1,162.18x = 1,603.81 × 664.80
4. Step 4: Simplify right side
   1,162.18x = 1,066,212.89
5. Step 5: Solve for x
   x = 1,066,212.89/1,162.18
6. Step 6: Final answer
   x = 917.42