Finding the Fourth Proportional to 2,103.89, 3,154.82 and 870.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.89 : 3,154.82 = 870.39 : x
2. Step 2: Convert to fraction form
   2,103.89/3,154.82 = 870.39/x
3. Step 3: Cross multiply
   2,103.89x = 3,154.82 × 870.39
4. Step 4: Simplify right side
   2,103.89x = 2,745,919.43
5. Step 5: Solve for x
   x = 2,745,919.43/2,103.89
6. Step 6: Final answer
   x = 1,305.17