Finding the Fourth Proportional to 2,158.21, 2,978.25 and 1,214.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.21 : 2,978.25 = 1,214.02 : x
2. Step 2: Convert to fraction form
   2,158.21/2,978.25 = 1,214.02/x
3. Step 3: Cross multiply
   2,158.21x = 2,978.25 × 1,214.02
4. Step 4: Simplify right side
   2,158.21x = 3,615,640.17
5. Step 5: Solve for x
   x = 3,615,640.17/2,158.21
6. Step 6: Final answer
   x = 1,675.30