Finding the Fourth Proportional to 1,288.28, 1,929.81 and 1,028.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.28 : 1,929.81 = 1,028.72 : x
2. Step 2: Convert to fraction form
   1,288.28/1,929.81 = 1,028.72/x
3. Step 3: Cross multiply
   1,288.28x = 1,929.81 × 1,028.72
4. Step 4: Simplify right side
   1,288.28x = 1,985,234.14
5. Step 5: Solve for x
   x = 1,985,234.14/1,288.28
6. Step 6: Final answer
   x = 1,541.00