Finding the Fourth Proportional to 20,709.42, 31,041.78 and 10,167.18

Step by Step Solution

1. Step 1: Write the proportion equation
   20,709.42 : 31,041.78 = 10,167.18 : x
2. Step 2: Convert to fraction form
   20,709.42/31,041.78 = 10,167.18/x
3. Step 3: Cross multiply
   20,709.42x = 31,041.78 × 10,167.18
4. Step 4: Simplify right side
   20,709.42x = 315,607,364.78
5. Step 5: Solve for x
   x = 315,607,364.78/20,709.42
6. Step 6: Final answer
   x = 15,239.80