Finding the Fourth Proportional to 7,978.95, 12,028.17 and 7,443.74

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.95 : 12,028.17 = 7,443.74 : x
2. Step 2: Convert to fraction form
   7,978.95/12,028.17 = 7,443.74/x
3. Step 3: Cross multiply
   7,978.95x = 12,028.17 × 7,443.74
4. Step 4: Simplify right side
   7,978.95x = 89,534,628.14
5. Step 5: Solve for x
   x = 89,534,628.14/7,978.95
6. Step 6: Final answer
   x = 11,221.35