Finding the Fourth Proportional to 2,128.82, 2,912.49 and 2,119.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.82 : 2,912.49 = 2,119.57 : x
2. Step 2: Convert to fraction form
   2,128.82/2,912.49 = 2,119.57/x
3. Step 3: Cross multiply
   2,128.82x = 2,912.49 × 2,119.57
4. Step 4: Simplify right side
   2,128.82x = 6,173,219.15
5. Step 5: Solve for x
   x = 6,173,219.15/2,128.82
6. Step 6: Final answer
   x = 2,899.84