Finding the Fourth Proportional to 2,158.91, 2,978.98 and 1,214.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.91 : 2,978.98 = 1,214.65 : x
2. Step 2: Convert to fraction form
   2,158.91/2,978.98 = 1,214.65/x
3. Step 3: Cross multiply
   2,158.91x = 2,978.98 × 1,214.65
4. Step 4: Simplify right side
   2,158.91x = 3,618,418.06
5. Step 5: Solve for x
   x = 3,618,418.06/2,158.91
6. Step 6: Final answer
   x = 1,676.04