Finding the Fourth Proportional to 2,103.47, 3,155.61 and 870.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.47 : 3,155.61 = 870.24 : x
2. Step 2: Convert to fraction form
   2,103.47/3,155.61 = 870.24/x
3. Step 3: Cross multiply
   2,103.47x = 3,155.61 × 870.24
4. Step 4: Simplify right side
   2,103.47x = 2,746,148.25
5. Step 5: Solve for x
   x = 2,746,148.25/2,103.47
6. Step 6: Final answer
   x = 1,305.53