Finding the Fourth Proportional to 21,777.22, 30,050.75 and 12,215.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,777.22 : 30,050.75 = 12,215.78 : x
2. Step 2: Convert to fraction form
   21,777.22/30,050.75 = 12,215.78/x
3. Step 3: Cross multiply
   21,777.22x = 30,050.75 × 12,215.78
4. Step 4: Simplify right side
   21,777.22x = 367,093,139.50
5. Step 5: Solve for x
   x = 367,093,139.50/21,777.22
6. Step 6: Final answer
   x = 16,856.75