Finding the Fourth Proportional to 21,180.52, 29,231.78 and 12,796.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,180.52 : 29,231.78 = 12,796.52 : x
2. Step 2: Convert to fraction form
   21,180.52/29,231.78 = 12,796.52/x
3. Step 3: Cross multiply
   21,180.52x = 29,231.78 × 12,796.52
4. Step 4: Simplify right side
   21,180.52x = 374,065,057.41
5. Step 5: Solve for x
   x = 374,065,057.41/21,180.52
6. Step 6: Final answer
   x = 17,660.81