Finding the Fourth Proportional to 1,011.78, 1,517.62 and 281.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.78 : 1,517.62 = 281.34 : x
2. Step 2: Convert to fraction form
   1,011.78/1,517.62 = 281.34/x
3. Step 3: Cross multiply
   1,011.78x = 1,517.62 × 281.34
4. Step 4: Simplify right side
   1,011.78x = 426,960.82
5. Step 5: Solve for x
   x = 426,960.82/1,011.78
6. Step 6: Final answer
   x = 421.99