Finding the Fourth Proportional to 30,789.40, 42,489.39 and 16,642.27

Step by Step Solution

1. Step 1: Write the proportion equation
   30,789.40 : 42,489.39 = 16,642.27 : x
2. Step 2: Convert to fraction form
   30,789.40/42,489.39 = 16,642.27/x
3. Step 3: Cross multiply
   30,789.40x = 42,489.39 × 16,642.27
4. Step 4: Simplify right side
   30,789.40x = 707,119,900.52
5. Step 5: Solve for x
   x = 707,119,900.52/30,789.40
6. Step 6: Final answer
   x = 22,966.34