Finding the Fourth Proportional to 30,968.16, 42,736.07 and 16,821

Step by Step Solution

1. Step 1: Write the proportion equation
   30,968.16 : 42,736.07 = 16,821 : x
2. Step 2: Convert to fraction form
   30,968.16/42,736.07 = 16,821/x
3. Step 3: Cross multiply
   30,968.16x = 42,736.07 × 16,821
4. Step 4: Simplify right side
   30,968.16x = 718,863,433.47
5. Step 5: Solve for x
   x = 718,863,433.47/30,968.16
6. Step 6: Final answer
   x = 23,212.98