Finding the Fourth Proportional to 1,009.40, 1,513.58 and 489.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.40 : 1,513.58 = 489.42 : x
2. Step 2: Convert to fraction form
   1,009.40/1,513.58 = 489.42/x
3. Step 3: Cross multiply
   1,009.40x = 1,513.58 × 489.42
4. Step 4: Simplify right side
   1,009.40x = 740,773.88
5. Step 5: Solve for x
   x = 740,773.88/1,009.40
6. Step 6: Final answer
   x = 733.88