Finding the Fourth Proportional to 19,644, 27,108.72 and 10,812

Step by Step Solution

1. Step 1: Write the proportion equation
   19,644 : 27,108.72 = 10,812 : x
2. Step 2: Convert to fraction form
   19,644/27,108.72 = 10,812/x
3. Step 3: Cross multiply
   19,644x = 27,108.72 × 10,812
4. Step 4: Simplify right side
   19,644x = 293,099,480.64
5. Step 5: Solve for x
   x = 293,099,480.64/19,644
6. Step 6: Final answer
   x = 14,920.56