Finding the Fourth Proportional to 2,109.81, 2,911.89 and 1,226.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.81 : 2,911.89 = 1,226.12 : x
2. Step 2: Convert to fraction form
   2,109.81/2,911.89 = 1,226.12/x
3. Step 3: Cross multiply
   2,109.81x = 2,911.89 × 1,226.12
4. Step 4: Simplify right side
   2,109.81x = 3,570,329.54
5. Step 5: Solve for x
   x = 3,570,329.54/2,109.81
6. Step 6: Final answer
   x = 1,692.26