Finding the Fourth Proportional to 31,112.96, 42,935.04 and 16,965.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.96 : 42,935.04 = 16,965.12 : x
2. Step 2: Convert to fraction form
   31,112.96/42,935.04 = 16,965.12/x
3. Step 3: Cross multiply
   31,112.96x = 42,935.04 × 16,965.12
4. Step 4: Simplify right side
   31,112.96x = 728,398,105.80
5. Step 5: Solve for x
   x = 728,398,105.80/31,112.96
6. Step 6: Final answer
   x = 23,411.40