Finding the Fourth Proportional to 1,191.94, 1,644.85 and 660.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.94 : 1,644.85 = 660.82 : x
2. Step 2: Convert to fraction form
   1,191.94/1,644.85 = 660.82/x
3. Step 3: Cross multiply
   1,191.94x = 1,644.85 × 660.82
4. Step 4: Simplify right side
   1,191.94x = 1,086,941.55
5. Step 5: Solve for x
   x = 1,086,941.55/1,191.94
6. Step 6: Final answer
   x = 911.91