Finding the Fourth Proportional to 1,009.79, 1,514.69 and 659.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,009.79 : 1,514.69 = 659.18 : x
2. Step 2: Convert to fraction form
   1,009.79/1,514.69 = 659.18/x
3. Step 3: Cross multiply
   1,009.79x = 1,514.69 × 659.18
4. Step 4: Simplify right side
   1,009.79x = 998,453.85
5. Step 5: Solve for x
   x = 998,453.85/1,009.79
6. Step 6: Final answer
   x = 988.78