Finding the Fourth Proportional to 31,078.94, 42,888.69 and 16,931.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.94 : 42,888.69 = 16,931.79 : x
2. Step 2: Convert to fraction form
   31,078.94/42,888.69 = 16,931.79/x
3. Step 3: Cross multiply
   31,078.94x = 42,888.69 × 16,931.79
4. Step 4: Simplify right side
   31,078.94x = 726,182,292.46
5. Step 5: Solve for x
   x = 726,182,292.46/31,078.94
6. Step 6: Final answer
   x = 23,365.74