Finding the Fourth Proportional to 2,861.43, 4,293.51 and 1,399.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.43 : 4,293.51 = 1,399.78 : x
2. Step 2: Convert to fraction form
   2,861.43/4,293.51 = 1,399.78/x
3. Step 3: Cross multiply
   2,861.43x = 4,293.51 × 1,399.78
4. Step 4: Simplify right side
   2,861.43x = 6,009,969.55
5. Step 5: Solve for x
   x = 6,009,969.55/2,861.43
6. Step 6: Final answer
   x = 2,100.34