Finding the Fourth Proportional to 2,158.56, 2,978.79 and 1,214.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.56 : 2,978.79 = 1,214.33 : x
2. Step 2: Convert to fraction form
   2,158.56/2,978.79 = 1,214.33/x
3. Step 3: Cross multiply
   2,158.56x = 2,978.79 × 1,214.33
4. Step 4: Simplify right side
   2,158.56x = 3,617,231.37
5. Step 5: Solve for x
   x = 3,617,231.37/2,158.56
6. Step 6: Final answer
   x = 1,675.76