Finding the Fourth Proportional to 19,986.48, 27,580.91 and 10,911.53

Step by Step Solution

1. Step 1: Write the proportion equation
   19,986.48 : 27,580.91 = 10,911.53 : x
2. Step 2: Convert to fraction form
   19,986.48/27,580.91 = 10,911.53/x
3. Step 3: Cross multiply
   19,986.48x = 27,580.91 × 10,911.53
4. Step 4: Simplify right side
   19,986.48x = 300,949,837.86
5. Step 5: Solve for x
   x = 300,949,837.86/19,986.48
6. Step 6: Final answer
   x = 15,057.67