Finding the Fourth Proportional to 2,814.56, 4,221.78 and 866.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,814.56 : 4,221.78 = 866.72 : x
2. Step 2: Convert to fraction form
   2,814.56/4,221.78 = 866.72/x
3. Step 3: Cross multiply
   2,814.56x = 4,221.78 × 866.72
4. Step 4: Simplify right side
   2,814.56x = 3,659,101.16
5. Step 5: Solve for x
   x = 3,659,101.16/2,814.56
6. Step 6: Final answer
   x = 1,300.06