Finding the Fourth Proportional to 1,019.33, 1,529.06 and 288.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.33 : 1,529.06 = 288.91 : x
2. Step 2: Convert to fraction form
   1,019.33/1,529.06 = 288.91/x
3. Step 3: Cross multiply
   1,019.33x = 1,529.06 × 288.91
4. Step 4: Simplify right side
   1,019.33x = 441,761.19
5. Step 5: Solve for x
   x = 441,761.19/1,019.33
6. Step 6: Final answer
   x = 433.38