Finding the Fourth Proportional to 2,103.35, 3,154.89 and 870.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.35 : 3,154.89 = 870.44 : x
2. Step 2: Convert to fraction form
   2,103.35/3,154.89 = 870.44/x
3. Step 3: Cross multiply
   2,103.35x = 3,154.89 × 870.44
4. Step 4: Simplify right side
   2,103.35x = 2,746,142.45
5. Step 5: Solve for x
   x = 2,746,142.45/2,103.35
6. Step 6: Final answer
   x = 1,305.60