Finding the Fourth Proportional to 31,019.40, 42,806.16 and 16,872.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,019.40 : 42,806.16 = 16,872.48 : x
2. Step 2: Convert to fraction form
   31,019.40/42,806.16 = 16,872.48/x
3. Step 3: Cross multiply
   31,019.40x = 42,806.16 × 16,872.48
4. Step 4: Simplify right side
   31,019.40x = 722,246,078.48
5. Step 5: Solve for x
   x = 722,246,078.48/31,019.40
6. Step 6: Final answer
   x = 23,283.69