Finding the Fourth Proportional to 1,725.28, 2,380.89 and 939.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.28 : 2,380.89 = 939.33 : x
2. Step 2: Convert to fraction form
   1,725.28/2,380.89 = 939.33/x
3. Step 3: Cross multiply
   1,725.28x = 2,380.89 × 939.33
4. Step 4: Simplify right side
   1,725.28x = 2,236,453.85
5. Step 5: Solve for x
   x = 2,236,453.85/1,725.28
6. Step 6: Final answer
   x = 1,296.28