Finding the Fourth Proportional to 31,115.42, 42,939.20 and 16,968.27

Step by Step Solution

1. Step 1: Write the proportion equation
   31,115.42 : 42,939.20 = 16,968.27 : x
2. Step 2: Convert to fraction form
   31,115.42/42,939.20 = 16,968.27/x
3. Step 3: Cross multiply
   31,115.42x = 42,939.20 × 16,968.27
4. Step 4: Simplify right side
   31,115.42x = 728,603,981.60
5. Step 5: Solve for x
   x = 728,603,981.60/31,115.42
6. Step 6: Final answer
   x = 23,416.17