Finding the Fourth Proportional to 28,504.50, 42,765.98 and 13,711.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,504.50 : 42,765.98 = 13,711.50 : x
2. Step 2: Convert to fraction form
   28,504.50/42,765.98 = 13,711.50/x
3. Step 3: Cross multiply
   28,504.50x = 42,765.98 × 13,711.50
4. Step 4: Simplify right side
   28,504.50x = 586,385,734.77
5. Step 5: Solve for x
   x = 586,385,734.77/28,504.50
6. Step 6: Final answer
   x = 20,571.69