Finding the Fourth Proportional to 1,866.05, 2,798.17 and 1,086.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,866.05 : 2,798.17 = 1,086.23 : x
2. Step 2: Convert to fraction form
   1,866.05/2,798.17 = 1,086.23/x
3. Step 3: Cross multiply
   1,866.05x = 2,798.17 × 1,086.23
4. Step 4: Simplify right side
   1,866.05x = 3,039,442.21
5. Step 5: Solve for x
   x = 3,039,442.21/1,866.05
6. Step 6: Final answer
   x = 1,628.82