Finding the Fourth Proportional to 1,162.80, 1,604.27 and 665.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.80 : 1,604.27 = 665.09 : x
2. Step 2: Convert to fraction form
   1,162.80/1,604.27 = 665.09/x
3. Step 3: Cross multiply
   1,162.80x = 1,604.27 × 665.09
4. Step 4: Simplify right side
   1,162.80x = 1,066,972.59
5. Step 5: Solve for x
   x = 1,066,972.59/1,162.80
6. Step 6: Final answer
   x = 917.59