Finding the Fourth Proportional to 21,777.78, 32,625.55 and 12,866.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,777.78 : 32,625.55 = 12,866.52 : x
2. Step 2: Convert to fraction form
   21,777.78/32,625.55 = 12,866.52/x
3. Step 3: Cross multiply
   21,777.78x = 32,625.55 × 12,866.52
4. Step 4: Simplify right side
   21,777.78x = 419,777,291.59
5. Step 5: Solve for x
   x = 419,777,291.59/21,777.78
6. Step 6: Final answer
   x = 19,275.49