Finding the Fourth Proportional to 2,079.91, 3,118.41 and 780.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.91 : 3,118.41 = 780.25 : x
2. Step 2: Convert to fraction form
   2,079.91/3,118.41 = 780.25/x
3. Step 3: Cross multiply
   2,079.91x = 3,118.41 × 780.25
4. Step 4: Simplify right side
   2,079.91x = 2,433,139.40
5. Step 5: Solve for x
   x = 2,433,139.40/2,079.91
6. Step 6: Final answer
   x = 1,169.83