Finding the Fourth Proportional to 9,340.76, 12,978.71 and 9,243.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,340.76 : 12,978.71 = 9,243.26 : x
2. Step 2: Convert to fraction form
   9,340.76/12,978.71 = 9,243.26/x
3. Step 3: Cross multiply
   9,340.76x = 12,978.71 × 9,243.26
4. Step 4: Simplify right side
   9,340.76x = 119,965,500.72
5. Step 5: Solve for x
   x = 119,965,500.72/9,340.76
6. Step 6: Final answer
   x = 12,843.23