Finding the Fourth Proportional to 1,081.41, 1,621.71 and 850.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.41 : 1,621.71 = 850.75 : x
2. Step 2: Convert to fraction form
   1,081.41/1,621.71 = 850.75/x
3. Step 3: Cross multiply
   1,081.41x = 1,621.71 × 850.75
4. Step 4: Simplify right side
   1,081.41x = 1,379,669.78
5. Step 5: Solve for x
   x = 1,379,669.78/1,081.41
6. Step 6: Final answer
   x = 1,275.81