Finding the Fourth Proportional to 2,103.06, 3,155.80 and 870.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.06 : 3,155.80 = 870.24 : x
2. Step 2: Convert to fraction form
   2,103.06/3,155.80 = 870.24/x
3. Step 3: Cross multiply
   2,103.06x = 3,155.80 × 870.24
4. Step 4: Simplify right side
   2,103.06x = 2,746,303.39
5. Step 5: Solve for x
   x = 2,746,303.39/2,103.06
6. Step 6: Final answer
   x = 1,305.86