Finding the Fourth Proportional to 1,435.29, 1,980.72 and 805.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.29 : 1,980.72 = 805.86 : x
2. Step 2: Convert to fraction form
   1,435.29/1,980.72 = 805.86/x
3. Step 3: Cross multiply
   1,435.29x = 1,980.72 × 805.86
4. Step 4: Simplify right side
   1,435.29x = 1,596,183.02
5. Step 5: Solve for x
   x = 1,596,183.02/1,435.29
6. Step 6: Final answer
   x = 1,112.10