Finding the Fourth Proportional to 2,112.72, 2,913.88 and 1,971.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.72 : 2,913.88 = 1,971.26 : x
2. Step 2: Convert to fraction form
   2,112.72/2,913.88 = 1,971.26/x
3. Step 3: Cross multiply
   2,112.72x = 2,913.88 × 1,971.26
4. Step 4: Simplify right side
   2,112.72x = 5,744,015.09
5. Step 5: Solve for x
   x = 5,744,015.09/2,112.72
6. Step 6: Final answer
   x = 2,718.78