Finding the Fourth Proportional to 2,080.72, 3,121.06 and 847.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.72 : 3,121.06 = 847.85 : x
2. Step 2: Convert to fraction form
   2,080.72/3,121.06 = 847.85/x
3. Step 3: Cross multiply
   2,080.72x = 3,121.06 × 847.85
4. Step 4: Simplify right side
   2,080.72x = 2,646,190.72
5. Step 5: Solve for x
   x = 2,646,190.72/2,080.72
6. Step 6: Final answer
   x = 1,271.77