Finding the Fourth Proportional to 2,158.12, 3,231.69 and 1,426.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.12 : 3,231.69 = 1,426.60 : x
2. Step 2: Convert to fraction form
   2,158.12/3,231.69 = 1,426.60/x
3. Step 3: Cross multiply
   2,158.12x = 3,231.69 × 1,426.60
4. Step 4: Simplify right side
   2,158.12x = 4,610,328.95
5. Step 5: Solve for x
   x = 4,610,328.95/2,158.12
6. Step 6: Final answer
   x = 2,136.27