Finding the Fourth Proportional to 30,628.54, 42,271.30 and 18,689.34

Step by Step Solution

1. Step 1: Write the proportion equation
   30,628.54 : 42,271.30 = 18,689.34 : x
2. Step 2: Convert to fraction form
   30,628.54/42,271.30 = 18,689.34/x
3. Step 3: Cross multiply
   30,628.54x = 42,271.30 × 18,689.34
4. Step 4: Simplify right side
   30,628.54x = 790,022,697.94
5. Step 5: Solve for x
   x = 790,022,697.94/30,628.54
6. Step 6: Final answer
   x = 25,793.68