Finding the Fourth Proportional to 2,103.57, 3,153.06 and 870.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.57 : 3,153.06 = 870.30 : x
2. Step 2: Convert to fraction form
   2,103.57/3,153.06 = 870.30/x
3. Step 3: Cross multiply
   2,103.57x = 3,153.06 × 870.30
4. Step 4: Simplify right side
   2,103.57x = 2,744,108.12
5. Step 5: Solve for x
   x = 2,744,108.12/2,103.57
6. Step 6: Final answer
   x = 1,304.50