Finding the Fourth Proportional to 1,162.20, 1,603.79 and 664.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.20 : 1,603.79 = 664.83 : x
2. Step 2: Convert to fraction form
   1,162.20/1,603.79 = 664.83/x
3. Step 3: Cross multiply
   1,162.20x = 1,603.79 × 664.83
4. Step 4: Simplify right side
   1,162.20x = 1,066,247.71
5. Step 5: Solve for x
   x = 1,066,247.71/1,162.20
6. Step 6: Final answer
   x = 917.44