Finding the Fourth Proportional to 1,435.80, 1,981.41 and 806.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.80 : 1,981.41 = 806.39 : x
2. Step 2: Convert to fraction form
   1,435.80/1,981.41 = 806.39/x
3. Step 3: Cross multiply
   1,435.80x = 1,981.41 × 806.39
4. Step 4: Simplify right side
   1,435.80x = 1,597,789.21
5. Step 5: Solve for x
   x = 1,597,789.21/1,435.80
6. Step 6: Final answer
   x = 1,112.82