Finding the Fourth Proportional to 20,402.69, 30,538.42 and 10,528.52

Step by Step Solution

1. Step 1: Write the proportion equation
   20,402.69 : 30,538.42 = 10,528.52 : x
2. Step 2: Convert to fraction form
   20,402.69/30,538.42 = 10,528.52/x
3. Step 3: Cross multiply
   20,402.69x = 30,538.42 × 10,528.52
4. Step 4: Simplify right side
   20,402.69x = 321,524,186.73
5. Step 5: Solve for x
   x = 321,524,186.73/20,402.69
6. Step 6: Final answer
   x = 15,758.92