Finding the Fourth Proportional to 31,067.61, 42,871.24 and 18,320.17

Step by Step Solution

1. Step 1: Write the proportion equation
   31,067.61 : 42,871.24 = 18,320.17 : x
2. Step 2: Convert to fraction form
   31,067.61/42,871.24 = 18,320.17/x
3. Step 3: Cross multiply
   31,067.61x = 42,871.24 × 18,320.17
4. Step 4: Simplify right side
   31,067.61x = 785,408,404.91
5. Step 5: Solve for x
   x = 785,408,404.91/31,067.61
6. Step 6: Final answer
   x = 25,280.62