Finding the Fourth Proportional to 2,052.69, 3,080.27 and 819.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,052.69 : 3,080.27 = 819.91 : x
2. Step 2: Convert to fraction form
   2,052.69/3,080.27 = 819.91/x
3. Step 3: Cross multiply
   2,052.69x = 3,080.27 × 819.91
4. Step 4: Simplify right side
   2,052.69x = 2,525,544.18
5. Step 5: Solve for x
   x = 2,525,544.18/2,052.69
6. Step 6: Final answer
   x = 1,230.36