Finding the Fourth Proportional to 9,420.14, 12,999.52 and 5,171.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,420.14 : 12,999.52 = 5,171.18 : x
2. Step 2: Convert to fraction form
   9,420.14/12,999.52 = 5,171.18/x
3. Step 3: Cross multiply
   9,420.14x = 12,999.52 × 5,171.18
4. Step 4: Simplify right side
   9,420.14x = 67,222,857.83
5. Step 5: Solve for x
   x = 67,222,857.83/9,420.14
6. Step 6: Final answer
   x = 7,136.08