Finding the Fourth Proportional to 1,013.31, 1,519.83 and 282.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.31 : 1,519.83 = 282.87 : x
2. Step 2: Convert to fraction form
   1,013.31/1,519.83 = 282.87/x
3. Step 3: Cross multiply
   1,013.31x = 1,519.83 × 282.87
4. Step 4: Simplify right side
   1,013.31x = 429,914.31
5. Step 5: Solve for x
   x = 429,914.31/1,013.31
6. Step 6: Final answer
   x = 424.27