Finding the Fourth Proportional to 30,825.12, 42,538.59 and 16,678.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,825.12 : 42,538.59 = 16,678.20 : x
2. Step 2: Convert to fraction form
   30,825.12/42,538.59 = 16,678.20/x
3. Step 3: Cross multiply
   30,825.12x = 42,538.59 × 16,678.20
4. Step 4: Simplify right side
   30,825.12x = 709,467,111.74
5. Step 5: Solve for x
   x = 709,467,111.74/30,825.12
6. Step 6: Final answer
   x = 23,015.88