Finding the Fourth Proportional to 1,108.56, 1,529.73 and 660.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.56 : 1,529.73 = 660.42 : x
2. Step 2: Convert to fraction form
   1,108.56/1,529.73 = 660.42/x
3. Step 3: Cross multiply
   1,108.56x = 1,529.73 × 660.42
4. Step 4: Simplify right side
   1,108.56x = 1,010,264.29
5. Step 5: Solve for x
   x = 1,010,264.29/1,108.56
6. Step 6: Final answer
   x = 911.33