Finding the Fourth Proportional to 2,145.55, 2,960.67 and 1,214.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.55 : 2,960.67 = 1,214.05 : x
2. Step 2: Convert to fraction form
   2,145.55/2,960.67 = 1,214.05/x
3. Step 3: Cross multiply
   2,145.55x = 2,960.67 × 1,214.05
4. Step 4: Simplify right side
   2,145.55x = 3,594,401.41
5. Step 5: Solve for x
   x = 3,594,401.41/2,145.55
6. Step 6: Final answer
   x = 1,675.28