Finding the Fourth Proportional to 1,819.31, 2,728.25 and 779.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,819.31 : 2,728.25 = 779.27 : x
2. Step 2: Convert to fraction form
   1,819.31/2,728.25 = 779.27/x
3. Step 3: Cross multiply
   1,819.31x = 2,728.25 × 779.27
4. Step 4: Simplify right side
   1,819.31x = 2,126,039.48
5. Step 5: Solve for x
   x = 2,126,039.48/1,819.31
6. Step 6: Final answer
   x = 1,168.60