Finding the Fourth Proportional to 1,019.97, 1,530.05 and 289.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.97 : 1,530.05 = 289.56 : x
2. Step 2: Convert to fraction form
   1,019.97/1,530.05 = 289.56/x
3. Step 3: Cross multiply
   1,019.97x = 1,530.05 × 289.56
4. Step 4: Simplify right side
   1,019.97x = 443,041.28
5. Step 5: Solve for x
   x = 443,041.28/1,019.97
6. Step 6: Final answer
   x = 434.37