Finding the Fourth Proportional to 1,288.29, 1,923.81 and 1,011.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.29 : 1,923.81 = 1,011.27 : x
2. Step 2: Convert to fraction form
   1,288.29/1,923.81 = 1,011.27/x
3. Step 3: Cross multiply
   1,288.29x = 1,923.81 × 1,011.27
4. Step 4: Simplify right side
   1,288.29x = 1,945,491.34
5. Step 5: Solve for x
   x = 1,945,491.34/1,288.29
6. Step 6: Final answer
   x = 1,510.13