Finding the Fourth Proportional to 2,158.45, 2,978.48 and 1,214.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.45 : 2,978.48 = 1,214.39 : x
2. Step 2: Convert to fraction form
   2,158.45/2,978.48 = 1,214.39/x
3. Step 3: Cross multiply
   2,158.45x = 2,978.48 × 1,214.39
4. Step 4: Simplify right side
   2,158.45x = 3,617,046.81
5. Step 5: Solve for x
   x = 3,617,046.81/2,158.45
6. Step 6: Final answer
   x = 1,675.76