Finding the Fourth Proportional to 30,915.99, 42,662.90 and 16,768.53

Step by Step Solution

1. Step 1: Write the proportion equation
   30,915.99 : 42,662.90 = 16,768.53 : x
2. Step 2: Convert to fraction form
   30,915.99/42,662.90 = 16,768.53/x
3. Step 3: Cross multiply
   30,915.99x = 42,662.90 × 16,768.53
4. Step 4: Simplify right side
   30,915.99x = 715,394,034.69
5. Step 5: Solve for x
   x = 715,394,034.69/30,915.99
6. Step 6: Final answer
   x = 23,139.94