Finding the Fourth Proportional to 31,078.88, 42,889 and 16,931.84

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.88 : 42,889 = 16,931.84 : x
2. Step 2: Convert to fraction form
   31,078.88/42,889 = 16,931.84/x
3. Step 3: Cross multiply
   31,078.88x = 42,889 × 16,931.84
4. Step 4: Simplify right side
   31,078.88x = 726,189,685.76
5. Step 5: Solve for x
   x = 726,189,685.76/31,078.88
6. Step 6: Final answer
   x = 23,366.02