Finding the Fourth Proportional to 30,968.24, 42,736.24 and 16,820.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,968.24 : 42,736.24 = 16,820.78 : x
2. Step 2: Convert to fraction form
   30,968.24/42,736.24 = 16,820.78/x
3. Step 3: Cross multiply
   30,968.24x = 42,736.24 × 16,820.78
4. Step 4: Simplify right side
   30,968.24x = 718,856,891.07
5. Step 5: Solve for x
   x = 718,856,891.07/30,968.24
6. Step 6: Final answer
   x = 23,212.71