Finding the Fourth Proportional to 2,103.28, 3,155.09 and 870.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.28 : 3,155.09 = 870.46 : x
2. Step 2: Convert to fraction form
   2,103.28/3,155.09 = 870.46/x
3. Step 3: Cross multiply
   2,103.28x = 3,155.09 × 870.46
4. Step 4: Simplify right side
   2,103.28x = 2,746,359.51
5. Step 5: Solve for x
   x = 2,746,359.51/2,103.28
6. Step 6: Final answer
   x = 1,305.75