Finding the Fourth Proportional to 31,007.98, 42,791.55 and 16,860.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,007.98 : 42,791.55 = 16,860.91 : x
2. Step 2: Convert to fraction form
   31,007.98/42,791.55 = 16,860.91/x
3. Step 3: Cross multiply
   31,007.98x = 42,791.55 × 16,860.91
4. Step 4: Simplify right side
   31,007.98x = 721,504,473.31
5. Step 5: Solve for x
   x = 721,504,473.31/31,007.98
6. Step 6: Final answer
   x = 23,268.35