Finding the Fourth Proportional to 2,039.30, 3,059.34 and 869.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.30 : 3,059.34 = 869.28 : x
2. Step 2: Convert to fraction form
   2,039.30/3,059.34 = 869.28/x
3. Step 3: Cross multiply
   2,039.30x = 3,059.34 × 869.28
4. Step 4: Simplify right side
   2,039.30x = 2,659,423.08
5. Step 5: Solve for x
   x = 2,659,423.08/2,039.30
6. Step 6: Final answer
   x = 1,304.09