Finding the Fourth Proportional to 2,080.52, 3,121.50 and 1,389.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.52 : 3,121.50 = 1,389.96 : x
2. Step 2: Convert to fraction form
   2,080.52/3,121.50 = 1,389.96/x
3. Step 3: Cross multiply
   2,080.52x = 3,121.50 × 1,389.96
4. Step 4: Simplify right side
   2,080.52x = 4,338,760.14
5. Step 5: Solve for x
   x = 4,338,760.14/2,080.52
6. Step 6: Final answer
   x = 2,085.42