Finding the Fourth Proportional to 9,379.81, 12,929.25 and 7,387.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,379.81 : 12,929.25 = 7,387.21 : x
2. Step 2: Convert to fraction form
   9,379.81/12,929.25 = 7,387.21/x
3. Step 3: Cross multiply
   9,379.81x = 12,929.25 × 7,387.21
4. Step 4: Simplify right side
   9,379.81x = 95,511,084.89
5. Step 5: Solve for x
   x = 95,511,084.89/9,379.81
6. Step 6: Final answer
   x = 10,182.62