Finding the Fourth Proportional to 30,965.16, 42,731.96 and 16,818

Step by Step Solution

1. Step 1: Write the proportion equation
   30,965.16 : 42,731.96 = 16,818 : x
2. Step 2: Convert to fraction form
   30,965.16/42,731.96 = 16,818/x
3. Step 3: Cross multiply
   30,965.16x = 42,731.96 × 16,818
4. Step 4: Simplify right side
   30,965.16x = 718,666,103.28
5. Step 5: Solve for x
   x = 718,666,103.28/30,965.16
6. Step 6: Final answer
   x = 23,208.86