Finding the Fourth Proportional to 2,145.91, 2,964.24 and 1,679.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.91 : 2,964.24 = 1,679.72 : x
2. Step 2: Convert to fraction form
   2,145.91/2,964.24 = 1,679.72/x
3. Step 3: Cross multiply
   2,145.91x = 2,964.24 × 1,679.72
4. Step 4: Simplify right side
   2,145.91x = 4,979,087.63
5. Step 5: Solve for x
   x = 4,979,087.63/2,145.91
6. Step 6: Final answer
   x = 2,320.27