Finding the Fourth Proportional to 2,104.28, 3,155.89 and 872.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.28 : 3,155.89 = 872.03 : x
2. Step 2: Convert to fraction form
   2,104.28/3,155.89 = 872.03/x
3. Step 3: Cross multiply
   2,104.28x = 3,155.89 × 872.03
4. Step 4: Simplify right side
   2,104.28x = 2,752,030.76
5. Step 5: Solve for x
   x = 2,752,030.76/2,104.28
6. Step 6: Final answer
   x = 1,307.83