Finding the Fourth Proportional to 1,436.12, 1,981.72 and 806.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.12 : 1,981.72 = 806.55 : x
2. Step 2: Convert to fraction form
   1,436.12/1,981.72 = 806.55/x
3. Step 3: Cross multiply
   1,436.12x = 1,981.72 × 806.55
4. Step 4: Simplify right side
   1,436.12x = 1,598,356.27
5. Step 5: Solve for x
   x = 1,598,356.27/1,436.12
6. Step 6: Final answer
   x = 1,112.97