Finding the Fourth Proportional to 2,214.72, 3,321.29 and 808.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,214.72 : 3,321.29 = 808.76 : x
2. Step 2: Convert to fraction form
   2,214.72/3,321.29 = 808.76/x
3. Step 3: Cross multiply
   2,214.72x = 3,321.29 × 808.76
4. Step 4: Simplify right side
   2,214.72x = 2,686,105.85
5. Step 5: Solve for x
   x = 2,686,105.85/2,214.72
6. Step 6: Final answer
   x = 1,212.84