Finding the Fourth Proportional to 2,081.61, 3,124.49 and 1,107.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.61 : 3,124.49 = 1,107.72 : x
2. Step 2: Convert to fraction form
   2,081.61/3,124.49 = 1,107.72/x
3. Step 3: Cross multiply
   2,081.61x = 3,124.49 × 1,107.72
4. Step 4: Simplify right side
   2,081.61x = 3,461,054.52
5. Step 5: Solve for x
   x = 3,461,054.52/2,081.61
6. Step 6: Final answer
   x = 1,662.68