Finding the Fourth Proportional to 2,079.78, 3,118.82 and 1,039.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.78 : 3,118.82 = 1,039.40 : x
2. Step 2: Convert to fraction form
   2,079.78/3,118.82 = 1,039.40/x
3. Step 3: Cross multiply
   2,079.78x = 3,118.82 × 1,039.40
4. Step 4: Simplify right side
   2,079.78x = 3,241,701.51
5. Step 5: Solve for x
   x = 3,241,701.51/2,079.78
6. Step 6: Final answer
   x = 1,558.68