Finding the Fourth Proportional to 2,103.34, 3,155.19 and 870.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.34 : 3,155.19 = 870.34 : x
2. Step 2: Convert to fraction form
   2,103.34/3,155.19 = 870.34/x
3. Step 3: Cross multiply
   2,103.34x = 3,155.19 × 870.34
4. Step 4: Simplify right side
   2,103.34x = 2,746,088.06
5. Step 5: Solve for x
   x = 2,746,088.06/2,103.34
6. Step 6: Final answer
   x = 1,305.58