Finding the Fourth Proportional to 2,158.83, 2,979.16 and 1,214.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.83 : 2,979.16 = 1,214.78 : x
2. Step 2: Convert to fraction form
   2,158.83/2,979.16 = 1,214.78/x
3. Step 3: Cross multiply
   2,158.83x = 2,979.16 × 1,214.78
4. Step 4: Simplify right side
   2,158.83x = 3,619,028.40
5. Step 5: Solve for x
   x = 3,619,028.40/2,158.83
6. Step 6: Final answer
   x = 1,676.38