Finding the Fourth Proportional to 1,906.84, 2,857.88 and 1,085.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,906.84 : 2,857.88 = 1,085.80 : x
2. Step 2: Convert to fraction form
   1,906.84/2,857.88 = 1,085.80/x
3. Step 3: Cross multiply
   1,906.84x = 2,857.88 × 1,085.80
4. Step 4: Simplify right side
   1,906.84x = 3,103,086.10
5. Step 5: Solve for x
   x = 3,103,086.10/1,906.84
6. Step 6: Final answer
   x = 1,627.34