Finding the Fourth Proportional to 31,057.35, 42,859.32 and 16,910.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,057.35 : 42,859.32 = 16,910.31 : x
2. Step 2: Convert to fraction form
   31,057.35/42,859.32 = 16,910.31/x
3. Step 3: Cross multiply
   31,057.35x = 42,859.32 × 16,910.31
4. Step 4: Simplify right side
   31,057.35x = 724,764,387.59
5. Step 5: Solve for x
   x = 724,764,387.59/31,057.35
6. Step 6: Final answer
   x = 23,336.32