Finding the Fourth Proportional to 2,216.99, 3,059.27 and 1,222.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.99 : 3,059.27 = 1,222.21 : x
2. Step 2: Convert to fraction form
   2,216.99/3,059.27 = 1,222.21/x
3. Step 3: Cross multiply
   2,216.99x = 3,059.27 × 1,222.21
4. Step 4: Simplify right side
   2,216.99x = 3,739,056.63
5. Step 5: Solve for x
   x = 3,739,056.63/2,216.99
6. Step 6: Final answer
   x = 1,686.55