Finding the Fourth Proportional to 1,162.40, 1,604.15 and 665.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.40 : 1,604.15 = 665.03 : x
2. Step 2: Convert to fraction form
   1,162.40/1,604.15 = 665.03/x
3. Step 3: Cross multiply
   1,162.40x = 1,604.15 × 665.03
4. Step 4: Simplify right side
   1,162.40x = 1,066,796.53
5. Step 5: Solve for x
   x = 1,066,796.53/1,162.40
6. Step 6: Final answer
   x = 917.76