Finding the Fourth Proportional to 2,139.43, 3,210.36 and 1,214.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.43 : 3,210.36 = 1,214.41 : x
2. Step 2: Convert to fraction form
   2,139.43/3,210.36 = 1,214.41/x
3. Step 3: Cross multiply
   2,139.43x = 3,210.36 × 1,214.41
4. Step 4: Simplify right side
   2,139.43x = 3,898,693.29
5. Step 5: Solve for x
   x = 3,898,693.29/2,139.43
6. Step 6: Final answer
   x = 1,822.30