Finding the Fourth Proportional to 31,018.05, 42,805.17 and 18,440.37

Step by Step Solution

1. Step 1: Write the proportion equation
   31,018.05 : 42,805.17 = 18,440.37 : x
2. Step 2: Convert to fraction form
   31,018.05/42,805.17 = 18,440.37/x
3. Step 3: Cross multiply
   31,018.05x = 42,805.17 × 18,440.37
4. Step 4: Simplify right side
   31,018.05x = 789,343,172.71
5. Step 5: Solve for x
   x = 789,343,172.71/31,018.05
6. Step 6: Final answer
   x = 25,447.87