Finding the Fourth Proportional to 2,658.42, 3,985.20 and 1,426.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.42 : 3,985.20 = 1,426.68 : x
2. Step 2: Convert to fraction form
   2,658.42/3,985.20 = 1,426.68/x
3. Step 3: Cross multiply
   2,658.42x = 3,985.20 × 1,426.68
4. Step 4: Simplify right side
   2,658.42x = 5,685,605.14
5. Step 5: Solve for x
   x = 5,685,605.14/2,658.42
6. Step 6: Final answer
   x = 2,138.72