Finding the Fourth Proportional to 1,196.63, 1,651.31 and 665.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.63 : 1,651.31 = 665.51 : x
2. Step 2: Convert to fraction form
   1,196.63/1,651.31 = 665.51/x
3. Step 3: Cross multiply
   1,196.63x = 1,651.31 × 665.51
4. Step 4: Simplify right side
   1,196.63x = 1,098,962.92
5. Step 5: Solve for x
   x = 1,098,962.92/1,196.63
6. Step 6: Final answer
   x = 918.39