Finding the Fourth Proportional to 31,112.91, 42,936.08 and 16,965.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.91 : 42,936.08 = 16,965.72 : x
2. Step 2: Convert to fraction form
   31,112.91/42,936.08 = 16,965.72/x
3. Step 3: Cross multiply
   31,112.91x = 42,936.08 × 16,965.72
4. Step 4: Simplify right side
   31,112.91x = 728,441,426.35
5. Step 5: Solve for x
   x = 728,441,426.35/31,112.91
6. Step 6: Final answer
   x = 23,412.83