Finding the Fourth Proportional to 2,143.87, 3,214.89 and 1,219.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.87 : 3,214.89 = 1,219.86 : x
2. Step 2: Convert to fraction form
   2,143.87/3,214.89 = 1,219.86/x
3. Step 3: Cross multiply
   2,143.87x = 3,214.89 × 1,219.86
4. Step 4: Simplify right side
   2,143.87x = 3,921,715.72
5. Step 5: Solve for x
   x = 3,921,715.72/2,143.87
6. Step 6: Final answer
   x = 1,829.27