Finding the Fourth Proportional to 2,079.38, 2,868.29 and 1,239.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.38 : 2,868.29 = 1,239.53 : x
2. Step 2: Convert to fraction form
   2,079.38/2,868.29 = 1,239.53/x
3. Step 3: Cross multiply
   2,079.38x = 2,868.29 × 1,239.53
4. Step 4: Simplify right side
   2,079.38x = 3,555,315.61
5. Step 5: Solve for x
   x = 3,555,315.61/2,079.38
6. Step 6: Final answer
   x = 1,709.79