Finding the Fourth Proportional to 2,039.20, 2,814.12 and 1,107.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.20 : 2,814.12 = 1,107.72 : x
2. Step 2: Convert to fraction form
   2,039.20/2,814.12 = 1,107.72/x
3. Step 3: Cross multiply
   2,039.20x = 2,814.12 × 1,107.72
4. Step 4: Simplify right side
   2,039.20x = 3,117,257.01
5. Step 5: Solve for x
   x = 3,117,257.01/2,039.20
6. Step 6: Final answer
   x = 1,528.67