Finding the Fourth Proportional to 2,081.78, 3,121.69 and 1,107.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.78 : 3,121.69 = 1,107.62 : x
2. Step 2: Convert to fraction form
   2,081.78/3,121.69 = 1,107.62/x
3. Step 3: Cross multiply
   2,081.78x = 3,121.69 × 1,107.62
4. Step 4: Simplify right side
   2,081.78x = 3,457,646.28
5. Step 5: Solve for x
   x = 3,457,646.28/2,081.78
6. Step 6: Final answer
   x = 1,660.91