Finding the Fourth Proportional to 30,128.89, 41,578.94 and 18,189.90

Step by Step Solution

1. Step 1: Write the proportion equation
   30,128.89 : 41,578.94 = 18,189.90 : x
2. Step 2: Convert to fraction form
   30,128.89/41,578.94 = 18,189.90/x
3. Step 3: Cross multiply
   30,128.89x = 41,578.94 × 18,189.90
4. Step 4: Simplify right side
   30,128.89x = 756,316,760.71
5. Step 5: Solve for x
   x = 756,316,760.71/30,128.89
6. Step 6: Final answer
   x = 25,102.71