Finding the Fourth Proportional to 30,992.89, 42,771.21 and 18,243.76

Step by Step Solution

1. Step 1: Write the proportion equation
   30,992.89 : 42,771.21 = 18,243.76 : x
2. Step 2: Convert to fraction form
   30,992.89/42,771.21 = 18,243.76/x
3. Step 3: Cross multiply
   30,992.89x = 42,771.21 × 18,243.76
4. Step 4: Simplify right side
   30,992.89x = 780,307,690.15
5. Step 5: Solve for x
   x = 780,307,690.15/30,992.89
6. Step 6: Final answer
   x = 25,176.99