Finding the Fourth Proportional to 2,327.78, 3,490.72 and 767.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,327.78 : 3,490.72 = 767.72 : x
2. Step 2: Convert to fraction form
   2,327.78/3,490.72 = 767.72/x
3. Step 3: Cross multiply
   2,327.78x = 3,490.72 × 767.72
4. Step 4: Simplify right side
   2,327.78x = 2,679,895.56
5. Step 5: Solve for x
   x = 2,679,895.56/2,327.78
6. Step 6: Final answer
   x = 1,151.27