Finding the Fourth Proportional to 30,769.74, 42,476.42 and 18,021.15

Step by Step Solution

1. Step 1: Write the proportion equation
   30,769.74 : 42,476.42 = 18,021.15 : x
2. Step 2: Convert to fraction form
   30,769.74/42,476.42 = 18,021.15/x
3. Step 3: Cross multiply
   30,769.74x = 42,476.42 × 18,021.15
4. Step 4: Simplify right side
   30,769.74x = 765,473,846.18
5. Step 5: Solve for x
   x = 765,473,846.18/30,769.74
6. Step 6: Final answer
   x = 24,877.49