Finding the Fourth Proportional to 2,216.96, 3,059.40 and 1,222.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.96 : 3,059.40 = 1,222.28 : x
2. Step 2: Convert to fraction form
   2,216.96/3,059.40 = 1,222.28/x
3. Step 3: Cross multiply
   2,216.96x = 3,059.40 × 1,222.28
4. Step 4: Simplify right side
   2,216.96x = 3,739,428.14
5. Step 5: Solve for x
   x = 3,739,428.14/2,216.96
6. Step 6: Final answer
   x = 1,686.74