Finding the Fourth Proportional to 30,940.02, 42,687.42 and 18,189.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,940.02 : 42,687.42 = 18,189.12 : x
2. Step 2: Convert to fraction form
   30,940.02/42,687.42 = 18,189.12/x
3. Step 3: Cross multiply
   30,940.02x = 42,687.42 × 18,189.12
4. Step 4: Simplify right side
   30,940.02x = 776,446,604.87
5. Step 5: Solve for x
   x = 776,446,604.87/30,940.02
6. Step 6: Final answer
   x = 25,095.22