Finding the Fourth Proportional to 2,079.77, 3,118.73 and 780.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.77 : 3,118.73 = 780.32 : x
2. Step 2: Convert to fraction form
   2,079.77/3,118.73 = 780.32/x
3. Step 3: Cross multiply
   2,079.77x = 3,118.73 × 780.32
4. Step 4: Simplify right side
   2,079.77x = 2,433,587.90
5. Step 5: Solve for x
   x = 2,433,587.90/2,079.77
6. Step 6: Final answer
   x = 1,170.13