Finding the Fourth Proportional to 19,978.99, 27,578.88 and 12,019.66

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.99 : 27,578.88 = 12,019.66 : x
2. Step 2: Convert to fraction form
   19,978.99/27,578.88 = 12,019.66/x
3. Step 3: Cross multiply
   19,978.99x = 27,578.88 × 12,019.66
4. Step 4: Simplify right side
   19,978.99x = 331,488,691.83
5. Step 5: Solve for x
   x = 331,488,691.83/19,978.99
6. Step 6: Final answer
   x = 16,591.87