Finding the Fourth Proportional to 20,216.88, 27,900.42 and 12,153

Step by Step Solution

1. Step 1: Write the proportion equation
   20,216.88 : 27,900.42 = 12,153 : x
2. Step 2: Convert to fraction form
   20,216.88/27,900.42 = 12,153/x
3. Step 3: Cross multiply
   20,216.88x = 27,900.42 × 12,153
4. Step 4: Simplify right side
   20,216.88x = 339,073,804.26
5. Step 5: Solve for x
   x = 339,073,804.26/20,216.88
6. Step 6: Final answer
   x = 16,771.82