Finding the Fourth Proportional to 2,111.29, 2,911.91 and 1,969.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.29 : 2,911.91 = 1,969.81 : x
2. Step 2: Convert to fraction form
   2,111.29/2,911.91 = 1,969.81/x
3. Step 3: Cross multiply
   2,111.29x = 2,911.91 × 1,969.81
4. Step 4: Simplify right side
   2,111.29x = 5,735,909.44
5. Step 5: Solve for x
   x = 5,735,909.44/2,111.29
6. Step 6: Final answer
   x = 2,716.78