Finding the Fourth Proportional to 2,112.97, 2,916.72 and 1,891.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.97 : 2,916.72 = 1,891.53 : x
2. Step 2: Convert to fraction form
   2,112.97/2,916.72 = 1,891.53/x
3. Step 3: Cross multiply
   2,112.97x = 2,916.72 × 1,891.53
4. Step 4: Simplify right side
   2,112.97x = 5,517,063.38
5. Step 5: Solve for x
   x = 5,517,063.38/2,112.97
6. Step 6: Final answer
   x = 2,611.05