Finding the Fourth Proportional to 2,080.91, 3,121.91 and 985.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.91 : 3,121.91 = 985.25 : x
2. Step 2: Convert to fraction form
   2,080.91/3,121.91 = 985.25/x
3. Step 3: Cross multiply
   2,080.91x = 3,121.91 × 985.25
4. Step 4: Simplify right side
   2,080.91x = 3,075,861.83
5. Step 5: Solve for x
   x = 3,075,861.83/2,080.91
6. Step 6: Final answer
   x = 1,478.13