Finding the Fourth Proportional to 31,067.09, 42,880.31 and 19,140.65

Step by Step Solution

1. Step 1: Write the proportion equation
   31,067.09 : 42,880.31 = 19,140.65 : x
2. Step 2: Convert to fraction form
   31,067.09/42,880.31 = 19,140.65/x
3. Step 3: Cross multiply
   31,067.09x = 42,880.31 × 19,140.65
4. Step 4: Simplify right side
   31,067.09x = 820,757,005.60
5. Step 5: Solve for x
   x = 820,757,005.60/31,067.09
6. Step 6: Final answer
   x = 26,418.86