Finding the Fourth Proportional to 2,378.72, 3,281.29 and 1,678.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,378.72 : 3,281.29 = 1,678.88 : x
2. Step 2: Convert to fraction form
   2,378.72/3,281.29 = 1,678.88/x
3. Step 3: Cross multiply
   2,378.72x = 3,281.29 × 1,678.88
4. Step 4: Simplify right side
   2,378.72x = 5,508,871.55
5. Step 5: Solve for x
   x = 5,508,871.55/2,378.72
6. Step 6: Final answer
   x = 2,315.90