Finding the Fourth Proportional to 1,009.82, 1,514.43 and 279.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.82 : 1,514.43 = 279.23 : x
2. Step 2: Convert to fraction form
   1,009.82/1,514.43 = 279.23/x
3. Step 3: Cross multiply
   1,009.82x = 1,514.43 × 279.23
4. Step 4: Simplify right side
   1,009.82x = 422,866.72
5. Step 5: Solve for x
   x = 422,866.72/1,009.82
6. Step 6: Final answer
   x = 418.75