Finding the Fourth Proportional to 2,113.31, 3,171.13 and 864.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.31 : 3,171.13 = 864.59 : x
2. Step 2: Convert to fraction form
   2,113.31/3,171.13 = 864.59/x
3. Step 3: Cross multiply
   2,113.31x = 3,171.13 × 864.59
4. Step 4: Simplify right side
   2,113.31x = 2,741,709.27
5. Step 5: Solve for x
   x = 2,741,709.27/2,113.31
6. Step 6: Final answer
   x = 1,297.35