Finding the Fourth Proportional to 1,019.16, 1,528.42 and 288.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.16 : 1,528.42 = 288.76 : x
2. Step 2: Convert to fraction form
   1,019.16/1,528.42 = 288.76/x
3. Step 3: Cross multiply
   1,019.16x = 1,528.42 × 288.76
4. Step 4: Simplify right side
   1,019.16x = 441,346.56
5. Step 5: Solve for x
   x = 441,346.56/1,019.16
6. Step 6: Final answer
   x = 433.05