Finding the Fourth Proportional to 1,906.20, 2,860.47 and 1,085.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,906.20 : 2,860.47 = 1,085.04 : x
2. Step 2: Convert to fraction form
   1,906.20/2,860.47 = 1,085.04/x
3. Step 3: Cross multiply
   1,906.20x = 2,860.47 × 1,085.04
4. Step 4: Simplify right side
   1,906.20x = 3,103,724.37
5. Step 5: Solve for x
   x = 3,103,724.37/1,906.20
6. Step 6: Final answer
   x = 1,628.23