Finding the Fourth Proportional to 2,221.56, 3,065.69 and 1,213.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,221.56 : 3,065.69 = 1,213.29 : x
2. Step 2: Convert to fraction form
   2,221.56/3,065.69 = 1,213.29/x
3. Step 3: Cross multiply
   2,221.56x = 3,065.69 × 1,213.29
4. Step 4: Simplify right side
   2,221.56x = 3,719,564.95
5. Step 5: Solve for x
   x = 3,719,564.95/2,221.56
6. Step 6: Final answer
   x = 1,674.30