Finding the Fourth Proportional to 1,074.21, 1,481.68 and 809.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074.21 : 1,481.68 = 809.34 : x
2. Step 2: Convert to fraction form
   1,074.21/1,481.68 = 809.34/x
3. Step 3: Cross multiply
   1,074.21x = 1,481.68 × 809.34
4. Step 4: Simplify right side
   1,074.21x = 1,199,182.89
5. Step 5: Solve for x
   x = 1,199,182.89/1,074.21
6. Step 6: Final answer
   x = 1,116.34