Finding the Fourth Proportional to 30,982.72, 42,758.40 and 18,236.56

Step by Step Solution

1. Step 1: Write the proportion equation
   30,982.72 : 42,758.40 = 18,236.56 : x
2. Step 2: Convert to fraction form
   30,982.72/42,758.40 = 18,236.56/x
3. Step 3: Cross multiply
   30,982.72x = 42,758.40 × 18,236.56
4. Step 4: Simplify right side
   30,982.72x = 779,766,127.10
5. Step 5: Solve for x
   x = 779,766,127.10/30,982.72
6. Step 6: Final answer
   x = 25,167.78