Finding the Fourth Proportional to 2,257.15, 3,385.83 and 870.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,257.15 : 3,385.83 = 870.03 : x
2. Step 2: Convert to fraction form
   2,257.15/3,385.83 = 870.03/x
3. Step 3: Cross multiply
   2,257.15x = 3,385.83 × 870.03
4. Step 4: Simplify right side
   2,257.15x = 2,945,773.67
5. Step 5: Solve for x
   x = 2,945,773.67/2,257.15
6. Step 6: Final answer
   x = 1,305.09