Finding the Fourth Proportional to 2,131.91, 2,942.16 and 1,423.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.91 : 2,942.16 = 1,423.30 : x
2. Step 2: Convert to fraction form
   2,131.91/2,942.16 = 1,423.30/x
3. Step 3: Cross multiply
   2,131.91x = 2,942.16 × 1,423.30
4. Step 4: Simplify right side
   2,131.91x = 4,187,579.89
5. Step 5: Solve for x
   x = 4,187,579.89/2,131.91
6. Step 6: Final answer
   x = 1,964.24