Finding the Fourth Proportional to 2,817.89, 4,226.73 and 870.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,817.89 : 4,226.73 = 870.09 : x
2. Step 2: Convert to fraction form
   2,817.89/4,226.73 = 870.09/x
3. Step 3: Cross multiply
   2,817.89x = 4,226.73 × 870.09
4. Step 4: Simplify right side
   2,817.89x = 3,677,635.51
5. Step 5: Solve for x
   x = 3,677,635.51/2,817.89
6. Step 6: Final answer
   x = 1,305.10