Finding the Fourth Proportional to 2,158.66, 2,978.76 and 1,214.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.66 : 2,978.76 = 1,214.56 : x
2. Step 2: Convert to fraction form
   2,158.66/2,978.76 = 1,214.56/x
3. Step 3: Cross multiply
   2,158.66x = 2,978.76 × 1,214.56
4. Step 4: Simplify right side
   2,158.66x = 3,617,882.75
5. Step 5: Solve for x
   x = 3,617,882.75/2,158.66
6. Step 6: Final answer
   x = 1,675.99