Finding the Fourth Proportional to 2,081.96, 3,120.77 and 985.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.96 : 3,120.77 = 985.49 : x
2. Step 2: Convert to fraction form
   2,081.96/3,120.77 = 985.49/x
3. Step 3: Cross multiply
   2,081.96x = 3,120.77 × 985.49
4. Step 4: Simplify right side
   2,081.96x = 3,075,467.10
5. Step 5: Solve for x
   x = 3,075,467.10/2,081.96
6. Step 6: Final answer
   x = 1,477.20