Finding the Fourth Proportional to 2,109.98, 2,911.72 and 1,226.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.98 : 2,911.72 = 1,226.06 : x
2. Step 2: Convert to fraction form
   2,109.98/2,911.72 = 1,226.06/x
3. Step 3: Cross multiply
   2,109.98x = 2,911.72 × 1,226.06
4. Step 4: Simplify right side
   2,109.98x = 3,569,943.42
5. Step 5: Solve for x
   x = 3,569,943.42/2,109.98
6. Step 6: Final answer
   x = 1,691.93