Finding the Fourth Proportional to 23,138.72, 31,931.75 and 13,067.31

Step by Step Solution

1. Step 1: Write the proportion equation
   23,138.72 : 31,931.75 = 13,067.31 : x
2. Step 2: Convert to fraction form
   23,138.72/31,931.75 = 13,067.31/x
3. Step 3: Cross multiply
   23,138.72x = 31,931.75 × 13,067.31
4. Step 4: Simplify right side
   23,138.72x = 417,262,076.09
5. Step 5: Solve for x
   x = 417,262,076.09/23,138.72
6. Step 6: Final answer
   x = 18,033.07