Finding the Fourth Proportional to 31,014.28, 42,799.99 and 18,436.60

Step by Step Solution

1. Step 1: Write the proportion equation
   31,014.28 : 42,799.99 = 18,436.60 : x
2. Step 2: Convert to fraction form
   31,014.28/42,799.99 = 18,436.60/x
3. Step 3: Cross multiply
   31,014.28x = 42,799.99 × 18,436.60
4. Step 4: Simplify right side
   31,014.28x = 789,086,142.54
5. Step 5: Solve for x
   x = 789,086,142.54/31,014.28
6. Step 6: Final answer
   x = 25,442.67