Finding the Fourth Proportional to 2,080.69, 3,122.57 and 985.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.69 : 3,122.57 = 985.05 : x
2. Step 2: Convert to fraction form
   2,080.69/3,122.57 = 985.05/x
3. Step 3: Cross multiply
   2,080.69x = 3,122.57 × 985.05
4. Step 4: Simplify right side
   2,080.69x = 3,075,892.07
5. Step 5: Solve for x
   x = 3,075,892.07/2,080.69
6. Step 6: Final answer
   x = 1,478.31