Finding the Fourth Proportional to 31,007.78, 42,791.04 and 16,860.62

Step by Step Solution

1. Step 1: Write the proportion equation
   31,007.78 : 42,791.04 = 16,860.62 : x
2. Step 2: Convert to fraction form
   31,007.78/42,791.04 = 16,860.62/x
3. Step 3: Cross multiply
   31,007.78x = 42,791.04 × 16,860.62
4. Step 4: Simplify right side
   31,007.78x = 721,483,464.84
5. Step 5: Solve for x
   x = 721,483,464.84/31,007.78
6. Step 6: Final answer
   x = 23,267.82