Finding the Fourth Proportional to 30,965.34, 42,731.78 and 16,818.28

Step by Step Solution

1. Step 1: Write the proportion equation
   30,965.34 : 42,731.78 = 16,818.28 : x
2. Step 2: Convert to fraction form
   30,965.34/42,731.78 = 16,818.28/x
3. Step 3: Cross multiply
   30,965.34x = 42,731.78 × 16,818.28
4. Step 4: Simplify right side
   30,965.34x = 718,675,040.94
5. Step 5: Solve for x
   x = 718,675,040.94/30,965.34
6. Step 6: Final answer
   x = 23,209.02