Finding the Fourth Proportional to 1,191.24, 1,643.82 and 660.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.24 : 1,643.82 = 660.07 : x
2. Step 2: Convert to fraction form
   1,191.24/1,643.82 = 660.07/x
3. Step 3: Cross multiply
   1,191.24x = 1,643.82 × 660.07
4. Step 4: Simplify right side
   1,191.24x = 1,085,036.27
5. Step 5: Solve for x
   x = 1,085,036.27/1,191.24
6. Step 6: Final answer
   x = 910.85