Finding the Fourth Proportional to 2,145.18, 3,214.25 and 1,321.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.18 : 3,214.25 = 1,321.71 : x
2. Step 2: Convert to fraction form
   2,145.18/3,214.25 = 1,321.71/x
3. Step 3: Cross multiply
   2,145.18x = 3,214.25 × 1,321.71
4. Step 4: Simplify right side
   2,145.18x = 4,248,306.37
5. Step 5: Solve for x
   x = 4,248,306.37/2,145.18
6. Step 6: Final answer
   x = 1,980.40