Finding the Fourth Proportional to 2,100.21, 3,149.61 and 850.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.21 : 3,149.61 = 850.48 : x
2. Step 2: Convert to fraction form
   2,100.21/3,149.61 = 850.48/x
3. Step 3: Cross multiply
   2,100.21x = 3,149.61 × 850.48
4. Step 4: Simplify right side
   2,100.21x = 2,678,680.31
5. Step 5: Solve for x
   x = 2,678,680.31/2,100.21
6. Step 6: Final answer
   x = 1,275.43