Finding the Fourth Proportional to 19,940.56, 27,516.72 and 11,978.08

Step by Step Solution

1. Step 1: Write the proportion equation
   19,940.56 : 27,516.72 = 11,978.08 : x
2. Step 2: Convert to fraction form
   19,940.56/27,516.72 = 11,978.08/x
3. Step 3: Cross multiply
   19,940.56x = 27,516.72 × 11,978.08
4. Step 4: Simplify right side
   19,940.56x = 329,597,473.50
5. Step 5: Solve for x
   x = 329,597,473.50/19,940.56
6. Step 6: Final answer
   x = 16,529.00