Finding the Fourth Proportional to 20,939.34, 31,404.15 and 6,144.29

Step by Step Solution

1. Step 1: Write the proportion equation
   20,939.34 : 31,404.15 = 6,144.29 : x
2. Step 2: Convert to fraction form
   20,939.34/31,404.15 = 6,144.29/x
3. Step 3: Cross multiply
   20,939.34x = 31,404.15 × 6,144.29
4. Step 4: Simplify right side
   20,939.34x = 192,956,047.78
5. Step 5: Solve for x
   x = 192,956,047.78/20,939.34
6. Step 6: Final answer
   x = 9,215.00