Finding the Fourth Proportional to 19,978.11, 27,574.59 and 12,018.81

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.11 : 27,574.59 = 12,018.81 : x
2. Step 2: Convert to fraction form
   19,978.11/27,574.59 = 12,018.81/x
3. Step 3: Cross multiply
   19,978.11x = 27,574.59 × 12,018.81
4. Step 4: Simplify right side
   19,978.11x = 331,413,758.04
5. Step 5: Solve for x
   x = 331,413,758.04/19,978.11
6. Step 6: Final answer
   x = 16,588.84