Finding the Fourth Proportional to 30,885.34, 42,620.73 and 18,138.28

Step by Step Solution

1. Step 1: Write the proportion equation
   30,885.34 : 42,620.73 = 18,138.28 : x
2. Step 2: Convert to fraction form
   30,885.34/42,620.73 = 18,138.28/x
3. Step 3: Cross multiply
   30,885.34x = 42,620.73 × 18,138.28
4. Step 4: Simplify right side
   30,885.34x = 773,066,734.54
5. Step 5: Solve for x
   x = 773,066,734.54/30,885.34
6. Step 6: Final answer
   x = 25,030.22