Finding the Fourth Proportional to 31,078.28, 42,888.06 and 16,931.13

Step by Step Solution

1. Step 1: Write the proportion equation
   31,078.28 : 42,888.06 = 16,931.13 : x
2. Step 2: Convert to fraction form
   31,078.28/42,888.06 = 16,931.13/x
3. Step 3: Cross multiply
   31,078.28x = 42,888.06 × 16,931.13
4. Step 4: Simplify right side
   31,078.28x = 726,143,110.86
5. Step 5: Solve for x
   x = 726,143,110.86/31,078.28
6. Step 6: Final answer
   x = 23,364.97