Finding the Fourth Proportional to 1,196.93, 1,651.73 and 665.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.93 : 1,651.73 = 665.80 : x
2. Step 2: Convert to fraction form
   1,196.93/1,651.73 = 665.80/x
3. Step 3: Cross multiply
   1,196.93x = 1,651.73 × 665.80
4. Step 4: Simplify right side
   1,196.93x = 1,099,714.38
5. Step 5: Solve for x
   x = 1,099,714.38/1,196.93
6. Step 6: Final answer
   x = 918.78