Finding the Fourth Proportional to 19,665.28, 27,141.60 and 12,591.52

Step by Step Solution

1. Step 1: Write the proportion equation
   19,665.28 : 27,141.60 = 12,591.52 : x
2. Step 2: Convert to fraction form
   19,665.28/27,141.60 = 12,591.52/x
3. Step 3: Cross multiply
   19,665.28x = 27,141.60 × 12,591.52
4. Step 4: Simplify right side
   19,665.28x = 341,753,999.23
5. Step 5: Solve for x
   x = 341,753,999.23/19,665.28
6. Step 6: Final answer
   x = 17,378.55