Finding the Fourth Proportional to 12,979.20, 19,463.04 and 5,185.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,979.20 : 19,463.04 = 5,185.92 : x
2. Step 2: Convert to fraction form
   12,979.20/19,463.04 = 5,185.92/x
3. Step 3: Cross multiply
   12,979.20x = 19,463.04 × 5,185.92
4. Step 4: Simplify right side
   12,979.20x = 100,933,768.40
5. Step 5: Solve for x
   x = 100,933,768.40/12,979.20
6. Step 6: Final answer
   x = 7,776.58