Finding the Fourth Proportional to 7,142.88, 9,858.12 and 4,311.86

Step by Step Solution

1. Step 1: Write the proportion equation
   7,142.88 : 9,858.12 = 4,311.86 : x
2. Step 2: Convert to fraction form
   7,142.88/9,858.12 = 4,311.86/x
3. Step 3: Cross multiply
   7,142.88x = 9,858.12 × 4,311.86
4. Step 4: Simplify right side
   7,142.88x = 42,506,833.30
5. Step 5: Solve for x
   x = 42,506,833.30/7,142.88
6. Step 6: Final answer
   x = 5,950.94