Finding the Fourth Proportional to 31,078.89, 42,888.84 and 16,931.74

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.89 : 42,888.84 = 16,931.74 : x
2. Step 2: Convert to fraction form
   31,078.89/42,888.84 = 16,931.74/x
3. Step 3: Cross multiply
   31,078.89x = 42,888.84 × 16,931.74
4. Step 4: Simplify right side
   31,078.89x = 726,182,687.78
5. Step 5: Solve for x
   x = 726,182,687.78/31,078.89
6. Step 6: Final answer
   x = 23,365.79