Finding the Fourth Proportional to 2,101.28, 2,912.94 and 2,019.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.28 : 2,912.94 = 2,019.20 : x
2. Step 2: Convert to fraction form
   2,101.28/2,912.94 = 2,019.20/x
3. Step 3: Cross multiply
   2,101.28x = 2,912.94 × 2,019.20
4. Step 4: Simplify right side
   2,101.28x = 5,881,808.45
5. Step 5: Solve for x
   x = 5,881,808.45/2,101.28
6. Step 6: Final answer
   x = 2,799.16