Finding the Fourth Proportional to 31,067.30, 42,872.81 and 16,920.24

Step by Step Solution

1. Step 1: Write the proportion equation
   31,067.30 : 42,872.81 = 16,920.24 : x
2. Step 2: Convert to fraction form
   31,067.30/42,872.81 = 16,920.24/x
3. Step 3: Cross multiply
   31,067.30x = 42,872.81 × 16,920.24
4. Step 4: Simplify right side
   31,067.30x = 725,418,150.07
5. Step 5: Solve for x
   x = 725,418,150.07/31,067.30
6. Step 6: Final answer
   x = 23,349.90