Finding the Fourth Proportional to 19,978.12, 27,561.09 and 12,015.82

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.12 : 27,561.09 = 12,015.82 : x
2. Step 2: Convert to fraction form
   19,978.12/27,561.09 = 12,015.82/x
3. Step 3: Cross multiply
   19,978.12x = 27,561.09 × 12,015.82
4. Step 4: Simplify right side
   19,978.12x = 331,169,096.44
5. Step 5: Solve for x
   x = 331,169,096.44/19,978.12
6. Step 6: Final answer
   x = 16,576.59