Finding the Fourth Proportional to 9,389.72, 12,940.88 and 8,314.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,389.72 : 12,940.88 = 8,314.58 : x
2. Step 2: Convert to fraction form
   9,389.72/12,940.88 = 8,314.58/x
3. Step 3: Cross multiply
   9,389.72x = 12,940.88 × 8,314.58
4. Step 4: Simplify right side
   9,389.72x = 107,597,982.03
5. Step 5: Solve for x
   x = 107,597,982.03/9,389.72
6. Step 6: Final answer
   x = 11,459.13