Finding the Fourth Proportional to 30,968.50, 42,737.31 and 16,821.34

Step by Step Solution

1. Step 1: Write the proportion equation
   30,968.50 : 42,737.31 = 16,821.34 : x
2. Step 2: Convert to fraction form
   30,968.50/42,737.31 = 16,821.34/x
3. Step 3: Cross multiply
   30,968.50x = 42,737.31 × 16,821.34
4. Step 4: Simplify right side
   30,968.50x = 718,898,822.20
5. Step 5: Solve for x
   x = 718,898,822.20/30,968.50
6. Step 6: Final answer
   x = 23,213.87