Finding the Fourth Proportional to 1,196.30, 1,650.86 and 665.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.30 : 1,650.86 = 665.18 : x
2. Step 2: Convert to fraction form
   1,196.30/1,650.86 = 665.18/x
3. Step 3: Cross multiply
   1,196.30x = 1,650.86 × 665.18
4. Step 4: Simplify right side
   1,196.30x = 1,098,107.47
5. Step 5: Solve for x
   x = 1,098,107.47/1,196.30
6. Step 6: Final answer
   x = 917.92