Finding the Fourth Proportional to 1,435.87, 1,981.33 and 806.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.87 : 1,981.33 = 806.31 : x
2. Step 2: Convert to fraction form
   1,435.87/1,981.33 = 806.31/x
3. Step 3: Cross multiply
   1,435.87x = 1,981.33 × 806.31
4. Step 4: Simplify right side
   1,435.87x = 1,597,552.25
5. Step 5: Solve for x
   x = 1,597,552.25/1,435.87
6. Step 6: Final answer
   x = 1,112.61