Finding the Fourth Proportional to 3,942.30, 5,440.42 and 2,173.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,942.30 : 5,440.42 = 2,173.86 : x
2. Step 2: Convert to fraction form
   3,942.30/5,440.42 = 2,173.86/x
3. Step 3: Cross multiply
   3,942.30x = 5,440.42 × 2,173.86
4. Step 4: Simplify right side
   3,942.30x = 11,826,711.42
5. Step 5: Solve for x
   x = 11,826,711.42/3,942.30
6. Step 6: Final answer
   x = 2,999.95