Finding the Fourth Proportional to 10,830.72, 14,957.31 and 9,330.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,830.72 : 14,957.31 = 9,330.18 : x
2. Step 2: Convert to fraction form
   10,830.72/14,957.31 = 9,330.18/x
3. Step 3: Cross multiply
   10,830.72x = 14,957.31 × 9,330.18
4. Step 4: Simplify right side
   10,830.72x = 139,554,394.62
5. Step 5: Solve for x
   x = 139,554,394.62/10,830.72
6. Step 6: Final answer
   x = 12,885.05