Finding the Fourth Proportional to 2,109.77, 2,911.66 and 1,225.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.77 : 2,911.66 = 1,225.52 : x
2. Step 2: Convert to fraction form
   2,109.77/2,911.66 = 1,225.52/x
3. Step 3: Cross multiply
   2,109.77x = 2,911.66 × 1,225.52
4. Step 4: Simplify right side
   2,109.77x = 3,568,290.86
5. Step 5: Solve for x
   x = 3,568,290.86/2,109.77
6. Step 6: Final answer
   x = 1,691.32