Finding the Fourth Proportional to 20,156.76, 30,238.25 and 10,290.69

Step by Step Solution

1. Step 1: Write the proportion equation
   20,156.76 : 30,238.25 = 10,290.69 : x
2. Step 2: Convert to fraction form
   20,156.76/30,238.25 = 10,290.69/x
3. Step 3: Cross multiply
   20,156.76x = 30,238.25 × 10,290.69
4. Step 4: Simplify right side
   20,156.76x = 311,172,405.44
5. Step 5: Solve for x
   x = 311,172,405.44/20,156.76
6. Step 6: Final answer
   x = 15,437.62