Finding the Fourth Proportional to 2,109.96, 2,911.92 and 1,225.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.96 : 2,911.92 = 1,225.71 : x
2. Step 2: Convert to fraction form
   2,109.96/2,911.92 = 1,225.71/x
3. Step 3: Cross multiply
   2,109.96x = 2,911.92 × 1,225.71
4. Step 4: Simplify right side
   2,109.96x = 3,569,169.46
5. Step 5: Solve for x
   x = 3,569,169.46/2,109.96
6. Step 6: Final answer
   x = 1,691.58