Finding the Fourth Proportional to 1,098.81, 1,648.56 and 660.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.81 : 1,648.56 = 660.54 : x
2. Step 2: Convert to fraction form
   1,098.81/1,648.56 = 660.54/x
3. Step 3: Cross multiply
   1,098.81x = 1,648.56 × 660.54
4. Step 4: Simplify right side
   1,098.81x = 1,088,939.82
5. Step 5: Solve for x
   x = 1,088,939.82/1,098.81
6. Step 6: Final answer
   x = 991.02