Finding the Fourth Proportional to 31,014.28, 42,810.84 and 18,439

Step by Step Solution

1. Step 1: Write the proportion equation
   31,014.28 : 42,810.84 = 18,439 : x
2. Step 2: Convert to fraction form
   31,014.28/42,810.84 = 18,439/x
3. Step 3: Cross multiply
   31,014.28x = 42,810.84 × 18,439
4. Step 4: Simplify right side
   31,014.28x = 789,389,078.76
5. Step 5: Solve for x
   x = 789,389,078.76/31,014.28
6. Step 6: Final answer
   x = 25,452.44