Finding the Fourth Proportional to 1,976.78, 2,727.90 and 1,278.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,976.78 : 2,727.90 = 1,278.56 : x
2. Step 2: Convert to fraction form
   1,976.78/2,727.90 = 1,278.56/x
3. Step 3: Cross multiply
   1,976.78x = 2,727.90 × 1,278.56
4. Step 4: Simplify right side
   1,976.78x = 3,487,783.82
5. Step 5: Solve for x
   x = 3,487,783.82/1,976.78
6. Step 6: Final answer
   x = 1,764.38