Finding the Fourth Proportional to 20,760.24, 31,110.12 and 10,357.68

Step by Step Solution

1. Step 1: Write the proportion equation
   20,760.24 : 31,110.12 = 10,357.68 : x
2. Step 2: Convert to fraction form
   20,760.24/31,110.12 = 10,357.68/x
3. Step 3: Cross multiply
   20,760.24x = 31,110.12 × 10,357.68
4. Step 4: Simplify right side
   20,760.24x = 322,228,667.72
5. Step 5: Solve for x
   x = 322,228,667.72/20,760.24
6. Step 6: Final answer
   x = 15,521.43