Finding the Fourth Proportional to 20,619.12, 30,907.55 and 8,134.09

Step by Step Solution

1. Step 1: Write the proportion equation
   20,619.12 : 30,907.55 = 8,134.09 : x
2. Step 2: Convert to fraction form
   20,619.12/30,907.55 = 8,134.09/x
3. Step 3: Cross multiply
   20,619.12x = 30,907.55 × 8,134.09
4. Step 4: Simplify right side
   20,619.12x = 251,404,736.45
5. Step 5: Solve for x
   x = 251,404,736.45/20,619.12
6. Step 6: Final answer
   x = 12,192.80