Finding the Fourth Proportional to 31,078.88, 42,888.86 and 16,931.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.88 : 42,888.86 = 16,931.69 : x
2. Step 2: Convert to fraction form
   31,078.88/42,888.86 = 16,931.69/x
3. Step 3: Cross multiply
   31,078.88x = 42,888.86 × 16,931.69
4. Step 4: Simplify right side
   31,078.88x = 726,180,881.97
5. Step 5: Solve for x
   x = 726,180,881.97/31,078.88
6. Step 6: Final answer
   x = 23,365.74