Finding the Fourth Proportional to 30,936.77, 42,692.76 and 16,789.61

Step by Step Solution

1. Step 1: Write the proportion equation
   30,936.77 : 42,692.76 = 16,789.61 : x
2. Step 2: Convert to fraction form
   30,936.77/42,692.76 = 16,789.61/x
3. Step 3: Cross multiply
   30,936.77x = 42,692.76 × 16,789.61
4. Step 4: Simplify right side
   30,936.77x = 716,794,576.76
5. Step 5: Solve for x
   x = 716,794,576.76/30,936.77
6. Step 6: Final answer
   x = 23,169.67