Finding the Fourth Proportional to 31,021.20, 42,810.03 and 16,874.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,021.20 : 42,810.03 = 16,874.10 : x
2. Step 2: Convert to fraction form
   31,021.20/42,810.03 = 16,874.10/x
3. Step 3: Cross multiply
   31,021.20x = 42,810.03 × 16,874.10
4. Step 4: Simplify right side
   31,021.20x = 722,380,727.22
5. Step 5: Solve for x
   x = 722,380,727.22/31,021.20
6. Step 6: Final answer
   x = 23,286.68