Finding the Fourth Proportional to 1,491.16, 2,057.81 and 819.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,491.16 : 2,057.81 = 819.05 : x
2. Step 2: Convert to fraction form
   1,491.16/2,057.81 = 819.05/x
3. Step 3: Cross multiply
   1,491.16x = 2,057.81 × 819.05
4. Step 4: Simplify right side
   1,491.16x = 1,685,434.90
5. Step 5: Solve for x
   x = 1,685,434.90/1,491.16
6. Step 6: Final answer
   x = 1,130.28