Finding the Fourth Proportional to 3,931.54, 5,427.89 and 2,589.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.54 : 5,427.89 = 2,589.31 : x
2. Step 2: Convert to fraction form
   3,931.54/5,427.89 = 2,589.31/x
3. Step 3: Cross multiply
   3,931.54x = 5,427.89 × 2,589.31
4. Step 4: Simplify right side
   3,931.54x = 14,054,489.86
5. Step 5: Solve for x
   x = 14,054,489.86/3,931.54
6. Step 6: Final answer
   x = 3,574.81