Finding the Fourth Proportional to 1,012.35, 1,518.42 and 281.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.35 : 1,518.42 = 281.94 : x
2. Step 2: Convert to fraction form
   1,012.35/1,518.42 = 281.94/x
3. Step 3: Cross multiply
   1,012.35x = 1,518.42 × 281.94
4. Step 4: Simplify right side
   1,012.35x = 428,103.33
5. Step 5: Solve for x
   x = 428,103.33/1,012.35
6. Step 6: Final answer
   x = 422.88