Finding the Fourth Proportional to 20,115.27, 30,116.34 and 13,528.71

Step by Step Solution

1. Step 1: Write the proportion equation
   20,115.27 : 30,116.34 = 13,528.71 : x
2. Step 2: Convert to fraction form
   20,115.27/30,116.34 = 13,528.71/x
3. Step 3: Cross multiply
   20,115.27x = 30,116.34 × 13,528.71
4. Step 4: Simplify right side
   20,115.27x = 407,435,230.12
5. Step 5: Solve for x
   x = 407,435,230.12/20,115.27
6. Step 6: Final answer
   x = 20,255.02