Finding the Fourth Proportional to 1,288.30, 1,923.82 and 1,011.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.30 : 1,923.82 = 1,011.28 : x
2. Step 2: Convert to fraction form
   1,288.30/1,923.82 = 1,011.28/x
3. Step 3: Cross multiply
   1,288.30x = 1,923.82 × 1,011.28
4. Step 4: Simplify right side
   1,288.30x = 1,945,520.69
5. Step 5: Solve for x
   x = 1,945,520.69/1,288.30
6. Step 6: Final answer
   x = 1,510.15