Finding the Fourth Proportional to 30,991.89, 42,769.83 and 18,242.76

Step by Step Solution

1. Step 1: Write the proportion equation
   30,991.89 : 42,769.83 = 18,242.76 : x
2. Step 2: Convert to fraction form
   30,991.89/42,769.83 = 18,242.76/x
3. Step 3: Cross multiply
   30,991.89x = 42,769.83 × 18,242.76
4. Step 4: Simplify right side
   30,991.89x = 780,239,743.93
5. Step 5: Solve for x
   x = 780,239,743.93/30,991.89
6. Step 6: Final answer
   x = 25,175.61