Finding the Fourth Proportional to 2,219.28, 3,062.80 and 1,224.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.28 : 3,062.80 = 1,224.72 : x
2. Step 2: Convert to fraction form
   2,219.28/3,062.80 = 1,224.72/x
3. Step 3: Cross multiply
   2,219.28x = 3,062.80 × 1,224.72
4. Step 4: Simplify right side
   2,219.28x = 3,751,072.42
5. Step 5: Solve for x
   x = 3,751,072.42/2,219.28
6. Step 6: Final answer
   x = 1,690.22