Finding the Fourth Proportional to 31,128.72, 42,957.36 and 16,982.16

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.72 : 42,957.36 = 16,982.16 : x
2. Step 2: Convert to fraction form
   31,128.72/42,957.36 = 16,982.16/x
3. Step 3: Cross multiply
   31,128.72x = 42,957.36 × 16,982.16
4. Step 4: Simplify right side
   31,128.72x = 729,508,760.70
5. Step 5: Solve for x
   x = 729,508,760.70/31,128.72
6. Step 6: Final answer
   x = 23,435.23