Finding the Fourth Proportional to 19,978.72, 27,572.40 and 11,028.16

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.72 : 27,572.40 = 11,028.16 : x
2. Step 2: Convert to fraction form
   19,978.72/27,572.40 = 11,028.16/x
3. Step 3: Cross multiply
   19,978.72x = 27,572.40 × 11,028.16
4. Step 4: Simplify right side
   19,978.72x = 304,072,838.78
5. Step 5: Solve for x
   x = 304,072,838.78/19,978.72
6. Step 6: Final answer
   x = 15,219.84