Finding the Fourth Proportional to 30,789.37, 42,489.53 and 16,642.18

Step by Step Solution

1. Step 1: Write the proportion equation
   30,789.37 : 42,489.53 = 16,642.18 : x
2. Step 2: Convert to fraction form
   30,789.37/42,489.53 = 16,642.18/x
3. Step 3: Cross multiply
   30,789.37x = 42,489.53 × 16,642.18
4. Step 4: Simplify right side
   30,789.37x = 707,118,406.38
5. Step 5: Solve for x
   x = 707,118,406.38/30,789.37
6. Step 6: Final answer
   x = 22,966.32