Finding the Fourth Proportional to 2,309.37, 3,185.98 and 1,678.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309.37 : 3,185.98 = 1,678.51 : x
2. Step 2: Convert to fraction form
   2,309.37/3,185.98 = 1,678.51/x
3. Step 3: Cross multiply
   2,309.37x = 3,185.98 × 1,678.51
4. Step 4: Simplify right side
   2,309.37x = 5,347,717.48
5. Step 5: Solve for x
   x = 5,347,717.48/2,309.37
6. Step 6: Final answer
   x = 2,315.66