Finding the Fourth Proportional to 2,158.72, 2,978.94 and 1,214.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.72 : 2,978.94 = 1,214.50 : x
2. Step 2: Convert to fraction form
   2,158.72/2,978.94 = 1,214.50/x
3. Step 3: Cross multiply
   2,158.72x = 2,978.94 × 1,214.50
4. Step 4: Simplify right side
   2,158.72x = 3,617,922.63
5. Step 5: Solve for x
   x = 3,617,922.63/2,158.72
6. Step 6: Final answer
   x = 1,675.96