Finding the Fourth Proportional to 2,678.56, 4,018.40 and 946.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678.56 : 4,018.40 = 946.72 : x
2. Step 2: Convert to fraction form
   2,678.56/4,018.40 = 946.72/x
3. Step 3: Cross multiply
   2,678.56x = 4,018.40 × 946.72
4. Step 4: Simplify right side
   2,678.56x = 3,804,299.65
5. Step 5: Solve for x
   x = 3,804,299.65/2,678.56
6. Step 6: Final answer
   x = 1,420.28