Finding the Fourth Proportional to 10,326.81, 15,469.56 and 7,978.62

Step by Step Solution

1. Step 1: Write the proportion equation
   10,326.81 : 15,469.56 = 7,978.62 : x
2. Step 2: Convert to fraction form
   10,326.81/15,469.56 = 7,978.62/x
3. Step 3: Cross multiply
   10,326.81x = 15,469.56 × 7,978.62
4. Step 4: Simplify right side
   10,326.81x = 123,425,740.81
5. Step 5: Solve for x
   x = 123,425,740.81/10,326.81
6. Step 6: Final answer
   x = 11,951.97