Finding the Fourth Proportional to 1,183.80, 1,773.59 and 721.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,183.80 : 1,773.59 = 721.34 : x
2. Step 2: Convert to fraction form
   1,183.80/1,773.59 = 721.34/x
3. Step 3: Cross multiply
   1,183.80x = 1,773.59 × 721.34
4. Step 4: Simplify right side
   1,183.80x = 1,279,355.59
5. Step 5: Solve for x
   x = 1,279,355.59/1,183.80
6. Step 6: Final answer
   x = 1,080.72