Finding the Fourth Proportional to 1,019.99, 1,530.24 and 289.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.99 : 1,530.24 = 289.57 : x
2. Step 2: Convert to fraction form
   1,019.99/1,530.24 = 289.57/x
3. Step 3: Cross multiply
   1,019.99x = 1,530.24 × 289.57
4. Step 4: Simplify right side
   1,019.99x = 443,112.42
5. Step 5: Solve for x
   x = 443,112.42/1,019.99
6. Step 6: Final answer
   x = 434.43