Finding the Fourth Proportional to 1,529.78, 2,294.69 and 489.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,529.78 : 2,294.69 = 489.78 : x
2. Step 2: Convert to fraction form
   1,529.78/2,294.69 = 489.78/x
3. Step 3: Cross multiply
   1,529.78x = 2,294.69 × 489.78
4. Step 4: Simplify right side
   1,529.78x = 1,123,890.82
5. Step 5: Solve for x
   x = 1,123,890.82/1,529.78
6. Step 6: Final answer
   x = 734.68