Finding the Fourth Proportional to 31,118.92, 42,958.56 and 18,367.90

Step by Step Solution

1. Step 1: Write the proportion equation
   31,118.92 : 42,958.56 = 18,367.90 : x
2. Step 2: Convert to fraction form
   31,118.92/42,958.56 = 18,367.90/x
3. Step 3: Cross multiply
   31,118.92x = 42,958.56 × 18,367.90
4. Step 4: Simplify right side
   31,118.92x = 789,058,534.22
5. Step 5: Solve for x
   x = 789,058,534.22/31,118.92
6. Step 6: Final answer
   x = 25,356.23