Finding the Fourth Proportional to 2,109.71, 2,911.91 and 1,225.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.71 : 2,911.91 = 1,225.38 : x
2. Step 2: Convert to fraction form
   2,109.71/2,911.91 = 1,225.38/x
3. Step 3: Cross multiply
   2,109.71x = 2,911.91 × 1,225.38
4. Step 4: Simplify right side
   2,109.71x = 3,568,190.15
5. Step 5: Solve for x
   x = 3,568,190.15/2,109.71
6. Step 6: Final answer
   x = 1,691.32