Finding the Fourth Proportional to 30,767.88, 42,460.52 and 18,831

Step by Step Solution

1. Step 1: Write the proportion equation
   30,767.88 : 42,460.52 = 18,831 : x
2. Step 2: Convert to fraction form
   30,767.88/42,460.52 = 18,831/x
3. Step 3: Cross multiply
   30,767.88x = 42,460.52 × 18,831
4. Step 4: Simplify right side
   30,767.88x = 799,574,052.12
5. Step 5: Solve for x
   x = 799,574,052.12/30,767.88
6. Step 6: Final answer
   x = 25,987.30