Finding the Fourth Proportional to 2,216.85, 3,059.24 and 1,222.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.85 : 3,059.24 = 1,222.12 : x
2. Step 2: Convert to fraction form
   2,216.85/3,059.24 = 1,222.12/x
3. Step 3: Cross multiply
   2,216.85x = 3,059.24 × 1,222.12
4. Step 4: Simplify right side
   2,216.85x = 3,738,756.10
5. Step 5: Solve for x
   x = 3,738,756.10/2,216.85
6. Step 6: Final answer
   x = 1,686.52