Finding the Fourth Proportional to 2,727.90, 4,091.94 and 780.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,727.90 : 4,091.94 = 780.30 : x
2. Step 2: Convert to fraction form
   2,727.90/4,091.94 = 780.30/x
3. Step 3: Cross multiply
   2,727.90x = 4,091.94 × 780.30
4. Step 4: Simplify right side
   2,727.90x = 3,192,940.78
5. Step 5: Solve for x
   x = 3,192,940.78/2,727.90
6. Step 6: Final answer
   x = 1,170.48