Finding the Fourth Proportional to 1,196.87, 1,651.59 and 665.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.87 : 1,651.59 = 665.71 : x
2. Step 2: Convert to fraction form
   1,196.87/1,651.59 = 665.71/x
3. Step 3: Cross multiply
   1,196.87x = 1,651.59 × 665.71
4. Step 4: Simplify right side
   1,196.87x = 1,099,475.85
5. Step 5: Solve for x
   x = 1,099,475.85/1,196.87
6. Step 6: Final answer
   x = 918.63