Finding the Fourth Proportional to 20,139.18, 30,182.49 and 10,270.14

Step by Step Solution

1. Step 1: Write the proportion equation
   20,139.18 : 30,182.49 = 10,270.14 : x
2. Step 2: Convert to fraction form
   20,139.18/30,182.49 = 10,270.14/x
3. Step 3: Cross multiply
   20,139.18x = 30,182.49 × 10,270.14
4. Step 4: Simplify right side
   20,139.18x = 309,978,397.85
5. Step 5: Solve for x
   x = 309,978,397.85/20,139.18
6. Step 6: Final answer
   x = 15,391.81