Finding the Fourth Proportional to 30,789.36, 42,489.27 and 16,642.17

Step by Step Solution

1. Step 1: Write the proportion equation
   30,789.36 : 42,489.27 = 16,642.17 : x
2. Step 2: Convert to fraction form
   30,789.36/42,489.27 = 16,642.17/x
3. Step 3: Cross multiply
   30,789.36x = 42,489.27 × 16,642.17
4. Step 4: Simplify right side
   30,789.36x = 707,113,654.52
5. Step 5: Solve for x
   x = 707,113,654.52/30,789.36
6. Step 6: Final answer
   x = 22,966.17