Finding the Fourth Proportional to 2,824.72, 4,236.91 and 850.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,824.72 : 4,236.91 = 850.31 : x
2. Step 2: Convert to fraction form
   2,824.72/4,236.91 = 850.31/x
3. Step 3: Cross multiply
   2,824.72x = 4,236.91 × 850.31
4. Step 4: Simplify right side
   2,824.72x = 3,602,686.94
5. Step 5: Solve for x
   x = 3,602,686.94/2,824.72
6. Step 6: Final answer
   x = 1,275.41