Finding the Fourth Proportional to 7,978.92, 12,028.11 and 7,443.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.92 : 12,028.11 = 7,443.72 : x
2. Step 2: Convert to fraction form
   7,978.92/12,028.11 = 7,443.72/x
3. Step 3: Cross multiply
   7,978.92x = 12,028.11 × 7,443.72
4. Step 4: Simplify right side
   7,978.92x = 89,533,882.97
5. Step 5: Solve for x
   x = 89,533,882.97/7,978.92
6. Step 6: Final answer
   x = 11,221.30