Finding the Fourth Proportional to 2,053.90, 3,080.59 and 821.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,053.90 : 3,080.59 = 821.32 : x
2. Step 2: Convert to fraction form
   2,053.90/3,080.59 = 821.32/x
3. Step 3: Cross multiply
   2,053.90x = 3,080.59 × 821.32
4. Step 4: Simplify right side
   2,053.90x = 2,530,157.03
5. Step 5: Solve for x
   x = 2,530,157.03/2,053.90
6. Step 6: Final answer
   x = 1,231.88