Finding the Fourth Proportional to 19,931.20, 27,504.72 and 10,979.54

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.20 : 27,504.72 = 10,979.54 : x
2. Step 2: Convert to fraction form
   19,931.20/27,504.72 = 10,979.54/x
3. Step 3: Cross multiply
   19,931.20x = 27,504.72 × 10,979.54
4. Step 4: Simplify right side
   19,931.20x = 301,989,173.43
5. Step 5: Solve for x
   x = 301,989,173.43/19,931.20
6. Step 6: Final answer
   x = 15,151.58