Finding the Fourth Proportional to 14,286.72, 21,405.69 and 10,119.81

Step by Step Solution

1. Step 1: Write the proportion equation
   14,286.72 : 21,405.69 = 10,119.81 : x
2. Step 2: Convert to fraction form
   14,286.72/21,405.69 = 10,119.81/x
3. Step 3: Cross multiply
   14,286.72x = 21,405.69 × 10,119.81
4. Step 4: Simplify right side
   14,286.72x = 216,621,515.72
5. Step 5: Solve for x
   x = 216,621,515.72/14,286.72
6. Step 6: Final answer
   x = 15,162.44