Finding the Fourth Proportional to 1,108.49, 1,529.89 and 660.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.49 : 1,529.89 = 660.38 : x
2. Step 2: Convert to fraction form
   1,108.49/1,529.89 = 660.38/x
3. Step 3: Cross multiply
   1,108.49x = 1,529.89 × 660.38
4. Step 4: Simplify right side
   1,108.49x = 1,010,299.46
5. Step 5: Solve for x
   x = 1,010,299.46/1,108.49
6. Step 6: Final answer
   x = 911.42