Finding the Fourth Proportional to 10,311.42, 14,235.68 and 7,171.86

Step by Step Solution

1. Step 1: Write the proportion equation
   10,311.42 : 14,235.68 = 7,171.86 : x
2. Step 2: Convert to fraction form
   10,311.42/14,235.68 = 7,171.86/x
3. Step 3: Cross multiply
   10,311.42x = 14,235.68 × 7,171.86
4. Step 4: Simplify right side
   10,311.42x = 102,096,303.96
5. Step 5: Solve for x
   x = 102,096,303.96/10,311.42
6. Step 6: Final answer
   x = 9,901.28