Finding the Fourth Proportional to 30,128.61, 41,577.42 and 18,189.60

Step by Step Solution

1. Step 1: Write the proportion equation
   30,128.61 : 41,577.42 = 18,189.60 : x
2. Step 2: Convert to fraction form
   30,128.61/41,577.42 = 18,189.60/x
3. Step 3: Cross multiply
   30,128.61x = 41,577.42 × 18,189.60
4. Step 4: Simplify right side
   30,128.61x = 756,276,638.83
5. Step 5: Solve for x
   x = 756,276,638.83/30,128.61
6. Step 6: Final answer
   x = 25,101.61