Finding the Fourth Proportional to 2,109.11, 2,910.56 and 1,225.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.11 : 2,910.56 = 1,225.43 : x
2. Step 2: Convert to fraction form
   2,109.11/2,910.56 = 1,225.43/x
3. Step 3: Cross multiply
   2,109.11x = 2,910.56 × 1,225.43
4. Step 4: Simplify right side
   2,109.11x = 3,566,687.54
5. Step 5: Solve for x
   x = 3,566,687.54/2,109.11
6. Step 6: Final answer
   x = 1,691.09