Finding the Fourth Proportional to 2,158.52, 2,978.70 and 1,214.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.52 : 2,978.70 = 1,214.42 : x
2. Step 2: Convert to fraction form
   2,158.52/2,978.70 = 1,214.42/x
3. Step 3: Cross multiply
   2,158.52x = 2,978.70 × 1,214.42
4. Step 4: Simplify right side
   2,158.52x = 3,617,392.85
5. Step 5: Solve for x
   x = 3,617,392.85/2,158.52
6. Step 6: Final answer
   x = 1,675.87