Finding the Fourth Proportional to 2,079.12, 2,868.72 and 1,240.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.12 : 2,868.72 = 1,240.12 : x
2. Step 2: Convert to fraction form
   2,079.12/2,868.72 = 1,240.12/x
3. Step 3: Cross multiply
   2,079.12x = 2,868.72 × 1,240.12
4. Step 4: Simplify right side
   2,079.12x = 3,557,557.05
5. Step 5: Solve for x
   x = 3,557,557.05/2,079.12
6. Step 6: Final answer
   x = 1,711.09