Finding the Fourth Proportional to 31,112.43, 42,934.94 and 16,965.87

Step by Step Solution

1. Step 1: Write the proportion equation
   31,112.43 : 42,934.94 = 16,965.87 : x
2. Step 2: Convert to fraction form
   31,112.43/42,934.94 = 16,965.87/x
3. Step 3: Cross multiply
   31,112.43x = 42,934.94 × 16,965.87
4. Step 4: Simplify right side
   31,112.43x = 728,428,525.67
5. Step 5: Solve for x
   x = 728,428,525.67/31,112.43
6. Step 6: Final answer
   x = 23,412.78