Finding the Fourth Proportional to 28,504.25, 42,765.61 and 13,711.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,504.25 : 42,765.61 = 13,711.25 : x
2. Step 2: Convert to fraction form
   28,504.25/42,765.61 = 13,711.25/x
3. Step 3: Cross multiply
   28,504.25x = 42,765.61 × 13,711.25
4. Step 4: Simplify right side
   28,504.25x = 586,369,722.01
5. Step 5: Solve for x
   x = 586,369,722.01/28,504.25
6. Step 6: Final answer
   x = 20,571.31