Finding the Fourth Proportional to 2,727.92, 4,092.20 and 780.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,727.92 : 4,092.20 = 780.28 : x
2. Step 2: Convert to fraction form
   2,727.92/4,092.20 = 780.28/x
3. Step 3: Cross multiply
   2,727.92x = 4,092.20 × 780.28
4. Step 4: Simplify right side
   2,727.92x = 3,193,061.82
5. Step 5: Solve for x
   x = 3,193,061.82/2,727.92
6. Step 6: Final answer
   x = 1,170.51