Finding the Fourth Proportional to 20,105.94, 30,149.32 and 9,012.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,105.94 : 30,149.32 = 9,012.72 : x
2. Step 2: Convert to fraction form
   20,105.94/30,149.32 = 9,012.72/x
3. Step 3: Cross multiply
   20,105.94x = 30,149.32 × 9,012.72
4. Step 4: Simplify right side
   20,105.94x = 271,727,379.35
5. Step 5: Solve for x
   x = 271,727,379.35/20,105.94
6. Step 6: Final answer
   x = 13,514.78