Finding the Fourth Proportional to 1,288.56, 1,933.81 and 1,039.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.56 : 1,933.81 = 1,039.00 : x
2. Step 2: Convert to fraction form
   1,288.56/1,933.81 = 1,039.00/x
3. Step 3: Cross multiply
   1,288.56x = 1,933.81 × 1,039.00
4. Step 4: Simplify right side
   1,288.56x = 2,009,223.81
5. Step 5: Solve for x
   x = 2,009,223.81/1,288.56
6. Step 6: Final answer
   x = 1,559.28