Finding the Fourth Proportional to 30,789.73, 42,489.83 and 16,642.57

Step by Step Solution

1. Step 1: Write the proportion equation
   30,789.73 : 42,489.83 = 16,642.57 : x
2. Step 2: Convert to fraction form
   30,789.73/42,489.83 = 16,642.57/x
3. Step 3: Cross multiply
   30,789.73x = 42,489.83 × 16,642.57
4. Step 4: Simplify right side
   30,789.73x = 707,139,970.06
5. Step 5: Solve for x
   x = 707,139,970.06/30,789.73
6. Step 6: Final answer
   x = 22,966.75