Finding the Fourth Proportional to 1,334.40, 1,840.56 and 809.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,334.40 : 1,840.56 = 809.76 : x
2. Step 2: Convert to fraction form
   1,334.40/1,840.56 = 809.76/x
3. Step 3: Cross multiply
   1,334.40x = 1,840.56 × 809.76
4. Step 4: Simplify right side
   1,334.40x = 1,490,411.87
5. Step 5: Solve for x
   x = 1,490,411.87/1,334.40
6. Step 6: Final answer
   x = 1,116.92