Finding the Fourth Proportional to 31,019.37, 42,805.47 and 16,872.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,019.37 : 42,805.47 = 16,872.21 : x
2. Step 2: Convert to fraction form
   31,019.37/42,805.47 = 16,872.21/x
3. Step 3: Cross multiply
   31,019.37x = 42,805.47 × 16,872.21
4. Step 4: Simplify right side
   31,019.37x = 722,222,878.99
5. Step 5: Solve for x
   x = 722,222,878.99/31,019.37
6. Step 6: Final answer
   x = 23,282.96