Finding the Fourth Proportional to 20,404.38, 30,581.94 and 10,538.28

Step by Step Solution

1. Step 1: Write the proportion equation
   20,404.38 : 30,581.94 = 10,538.28 : x
2. Step 2: Convert to fraction form
   20,404.38/30,581.94 = 10,538.28/x
3. Step 3: Cross multiply
   20,404.38x = 30,581.94 × 10,538.28
4. Step 4: Simplify right side
   20,404.38x = 322,281,046.66
5. Step 5: Solve for x
   x = 322,281,046.66/20,404.38
6. Step 6: Final answer
   x = 15,794.70