Finding the Fourth Proportional to 2,945.78, 4,064.86 and 1,687.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,945.78 : 4,064.86 = 1,687.18 : x
2. Step 2: Convert to fraction form
   2,945.78/4,064.86 = 1,687.18/x
3. Step 3: Cross multiply
   2,945.78x = 4,064.86 × 1,687.18
4. Step 4: Simplify right side
   2,945.78x = 6,858,145.32
5. Step 5: Solve for x
   x = 6,858,145.32/2,945.78
6. Step 6: Final answer
   x = 2,328.12