Finding the Fourth Proportional to 2,167.57, 2,991.58 and 1,423.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.57 : 2,991.58 = 1,423.69 : x
2. Step 2: Convert to fraction form
   2,167.57/2,991.58 = 1,423.69/x
3. Step 3: Cross multiply
   2,167.57x = 2,991.58 × 1,423.69
4. Step 4: Simplify right side
   2,167.57x = 4,259,082.53
5. Step 5: Solve for x
   x = 4,259,082.53/2,167.57
6. Step 6: Final answer
   x = 1,964.91